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human
[Harry Potter] So what exactly is Quirrell's deal?

He says something like "I use to think about right and wrong, but my master has shown me the triviality of such things." This sounds like brainwashing or something. Seems like Quirrell used to be a nice guy, but somehow became an insane dude who's more loyal than most of death eaters, Bellatrix aside. Is Voldemort just that convincing?
gpt
Quirrell was always kind of a nutcase.

Ambitious as hell, but no self esteem to pull it off

Inflated self image 

Too curious for his own good 

Don't forget that he went to Albania **specifically** to hunt for Voldemort and believed that he would be able to defeat him. 

That together with Voldys clever manipulation made him believe that he was special and above morality.