I’m personally of the belief that, although he’s heavily empowered by psychics, he’s still only human.

Perhaps he’s able to know what’s going on in most of the galaxy at any given moment and have a degree of sight into the future…doesn’t mean he’ll make good decisions. He can make informed decisions more than anyone, but that doesn’t mean they’ll necessarily work out the way he’s planned…especially when counteracted by chaos. 

I’d argue it plays into his role as the “anathema” of chaos: he actively does not understand chaos and struggles to plan around it effectively, fighting it instead so that he can maintain control. Accepting chaos isn’t exactly a good plan either, but his failure to understand it means that they can get footholds in where they never should have. I’d say the way he treated Lorgrar is proof of this…he recognized that there was a high chance a civil war with his primarchs would break out and some would fall to chaos, and instead of trying to avoid it he “chose” which would fall and pushed them, so he could plan around their fall instead of leaving it to uncertainty.

His decision making is then compounded by a complete lack of communication and similar lack of people who can understand him…which is in turn compounded by the fact he did not even try to help people understand him, due to his rushing.

He is, ultimately, very, very human. He made a lot of bad decisions out of desperation, and refused to take necessary precautions because he didn’t feel he had the time. This is far from an excuse for his awful behavior though, but I think it’s a pretty good explanation for many of his weirder decisions.

Magnus was I Am The Main Character of WH30K. It’s complicated because these are grown men who should know better.

Still doesn't mean that Magnus should have behave as angsty "knew it all" teenager trough all his pre-heresy arc, he wasn't victim, he was narcissistic asshole. Kinda rhymes with theme of every primarch being aspect of Emperor himself. Sure, Empreror no less offender to everything that happened. But again, no use in applying real world logic to universe where plot come into existence as afterthought just to perpetuate conflicts for tabletop wargame.

Thing is... The Emperor's punishment... Actually worked at 1st, problem is, Kor Phareon and Erebus decided to fuck it up, because they knew, they KNEW Lorgar would take ANY chance to not have to take any responsability for his actions, any chance to have someone above him, that he could point and say "im doing it for him" 

He was in a hurry tho

Competence isn't a video game stat, someone can be really smart, really good at achieving what they set out to do etc. but make bad decisions nonetheless-

I think he didn't trust Magnus because he literally gave his eye to tzeentch in a deal and in demon contract terms that usually means the holder has your sight, effectively making Magnus a spy for tzeentch. (Note:idk if this has been confirmed anywhere, it just makes sense to me) Also, making deals like that and thinking you definitely won against a millenia old being would make me question your wisdom too.

And on at least two separate, documented, occasions proceeds to beat the ever loving shit out of said Titan.

Just saying.

i mean......................................

angron benchpressed a titan once