system
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human
[30k] Why did the Emperor do so little?

I understand he was working on the webway project, but how did he allow Chaos to create the heresy in the first place? He knew about Chaos and had several sons who were clearly unstable such as Angron, but didn't seem to have any back up plans once the heresy took root. 

Also, does he have any future sight abilities? Several Primarchs knew it was coming but he seemed to be totally oblivious.
gpt
He did have some backup plans, though they were against threats that he knew existed and they revolved around him not being hardly better than a corpse in a throne. He barely knew anything about the Warp when the Heresy started, and he was betrayed by who he thought was by far his most loyal comrade. All of his plans took a backseat to the webway project, and that was because the webway would have ensured that there would never be a need for a backup plan again. Sadly, we all know how that turned out.