One of the big assumptions is that the Emperor viewed the primarchs as his sons not as simply his tools to achieve somehting. Most fluff writes that the Primarchs view the Emperor as a father, the other primarchs as brothers and that the Imperium portrays them as his children and the heresy was a betrayal of a father by his son.
But the big unwritten part is what does the Emperor have to say about this? The Emperor is largely left out of Black Library fiction, with him and his character being talked about, but never really being present. There are of course exceptions. for example, 'The last church' where he is portrayed as a self righteous Richard Dawkins character, pushing his way and crushing opposition. Although he works through logic, he cannot accept any difference and is willing to do anything to achieve his way. Ian Watsons Inquisition wars novels also feature the Emperor. All the years of being on the throne have destoyed his mind, subdividing it into many multiple personalitys with no idea of what the other is doing. But that is old fluff.
What does seem to be becoming apparent to me, with the heresy novels, is that the Emperor has his own agenda and is pushing it. The Primarchs and marines see him as a father figure and are loyal to him. The Emperor sees them (and mankind as a whole) as tools to achieve his goal (or goals). Not everyone who has met the Emperor is as full of praise for him as his ultra loyal subjects. Some of his subjects are even beginning to question his motives.
With this in mind, it explains why he created the primarchs. It wasn't because he wanted sons or to create heirs to his empire. It was because he needed generals and powerful ones at that. He did not have the same loyalty for his primarchs as they had for him. But he was perfectly willing to use their loyaltys.
When the emperor created the primarchs, it is strongly hinted ne used chaos as part of the creation process. It is also hinted he knew exactly how they would be and then used their personalitys to get the most out of them.
Magnus thinks the Emperor is acting like a father and friend, but instead is betrayed. He discovers the Emperoro keeps secrets from him and also sets up a show trial and stabs him in the back. The Emperor reveals that his big plan was to keep Magnus imprisioned on the golden throne and that was the reason he created a priumarch as psychically powerful as Magnus.
The reason the Emperor ignored Magnus warning is because he had always viewed him as a thing of chaos and when Magnus warned him, presumed he was acting as a chaos entity. So he did not react to the warning but gave up on Magnus and decided to move forward his plan of enslaveing him on the Golden throne.
One of the reasons the Custodes were so willing to wipe out a primarch was that they had seen the Emperor create them and knew that in reality they were chaos creations so had no trust for them.
Of course it is also possible that the Heresy featured in the Emperors grand plan. There are multiple reasons for this, but I think one of the most prominent is that the Emperoro emerged from the Heresy as basically a god.
If the Emperor had acted differently, rather than telling everyone he had to concentrate on his project in the basement, he would of crushed the heresy, but would not of let the chaos in his primarchs run amock as he planned and iun turn would of lost his chance to achieve god like status.
But the big unwritten part is what does the Emperor have to say about this? The Emperor is largely left out of Black Library fiction, with him and his character being talked about, but never really being present. There are of course exceptions. for example, 'The last church' where he is portrayed as a self righteous Richard Dawkins character, pushing his way and crushing opposition. Although he works through logic, he cannot accept any difference and is willing to do anything to achieve his way. Ian Watsons Inquisition wars novels also feature the Emperor. All the years of being on the throne have destoyed his mind, subdividing it into many multiple personalitys with no idea of what the other is doing. But that is old fluff.
What does seem to be becoming apparent to me, with the heresy novels, is that the Emperor has his own agenda and is pushing it. The Primarchs and marines see him as a father figure and are loyal to him. The Emperor sees them (and mankind as a whole) as tools to achieve his goal (or goals). Not everyone who has met the Emperor is as full of praise for him as his ultra loyal subjects. Some of his subjects are even beginning to question his motives.
With this in mind, it explains why he created the primarchs. It wasn't because he wanted sons or to create heirs to his empire. It was because he needed generals and powerful ones at that. He did not have the same loyalty for his primarchs as they had for him. But he was perfectly willing to use their loyaltys.
When the emperor created the primarchs, it is strongly hinted ne used chaos as part of the creation process. It is also hinted he knew exactly how they would be and then used their personalitys to get the most out of them.
Magnus thinks the Emperor is acting like a father and friend, but instead is betrayed. He discovers the Emperoro keeps secrets from him and also sets up a show trial and stabs him in the back. The Emperor reveals that his big plan was to keep Magnus imprisioned on the golden throne and that was the reason he created a priumarch as psychically powerful as Magnus.
The reason the Emperor ignored Magnus warning is because he had always viewed him as a thing of chaos and when Magnus warned him, presumed he was acting as a chaos entity. So he did not react to the warning but gave up on Magnus and decided to move forward his plan of enslaveing him on the Golden throne.
One of the reasons the Custodes were so willing to wipe out a primarch was that they had seen the Emperor create them and knew that in reality they were chaos creations so had no trust for them.
Of course it is also possible that the Heresy featured in the Emperors grand plan. There are multiple reasons for this, but I think one of the most prominent is that the Emperoro emerged from the Heresy as basically a god.
If the Emperor had acted differently, rather than telling everyone he had to concentrate on his project in the basement, he would of crushed the heresy, but would not of let the chaos in his primarchs run amock as he planned and iun turn would of lost his chance to achieve god like status.