What even gave him the idea that primarchs will be less flawed

Probably the part where he made them in a laboratory with magic

>>49378486
The fact that he was so far above humans in pretty much every way (barring human interaction, empathy, and understanding), that he couldnt see any flaws in his own plan. Hubris basically.

>>49378486
>Sons of the Emperor
>Flawed
Purge yourself, heretic.

>>49378548
And that did fuck all to alter their still human psychology.

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>>49378486
Nothing.
He knew they would be flawed, like humanity is, like the universe is, but he also knew there would still have been a necessity for them and a love for them.

>>49378599
>implying the Traitors aren't flawed
Only a heretic would think they had no flaws.

Since he was perfect in every way he figured that he would also be perfect at parenting and therefore would be able to raise them all to also be perfect. It didn't work out obviously but that's life for you.

What other choices did he have?
Like I know my life is shit and will probably be shit in the future but I am not going to kill myself and try my best anyway.

The primarchs were a failed experiment, they were suppose to be raised by the big E until they were ready to lead the crusade. Their homeworlds and the culture they brought with then are what did it in for them.

>>49378486
They were made from his dna. Although in the case of Russ, he might've added canine dna.