system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Can anyone explain Vader's huge shift in personality as he fell to the Dark Side?

I get it, the Dark Side twists you to your very core. But is that all there is to Darth Vader's twisted personality? He's a true, wicked monster and he seems to be rather proud of that fact.  

Anakin fell because he wanted to help all the people around him, and felt the power granted by being a Jedi wasn't enough to do this. Why would he suddenly go from having a bit of a Messiah complex to being a complete monster bent on killing all in his way?
gpt
Because he had a *really* rough week.

The finale of the Clone Wars was a roller coaster from hell.  Wife's pregnant, wife's gonna die in childbirth, Yoda says fuck off, Chancellor says I'll help, Council says fuck you, Obi-Wan says spy on your politician buddy, politician buddy turns out to be Seriously Bad Bad Guy of Badness who just so happens to know of a way to cheat death, Bad Motherfucker says thanks for telling us, but fuck you and your wife, Anakin goes and pariahs himself by maiming Bad Motherfucker and maybe skewering a few babies in the quest to gain power, ends up really drunk off said power and assumes his wife and his best friend are together, Anakin experiments with erotic asphyxiation, best friend doesn't take too kindly to that, and turns Anakin into a naked s'more.

But he went through all this to try and protect his wife, only to find in the end that it was his own fault that she died.  And after that, anybody would be broken.  Anybody would consider themselves a complete monster.  By the time you see Vader in his prime, he's simply accepted that.