User blog comment:Looperreallyreallysucks/Pure Evil Discussion - Avengers: Endgame/@comment-1705775-20190509201229

Thanos? never - even at his worst he's not a Pure Evil character and never has been, even in comics.. he's an "unfettered" - a character who sees himself as doing what has to be done, whether others like it or not.. his change of heart was not to the extremes of a Pure Evil because he still actually has purpose etc for what he does beyond just personal enjoyment or evil.

Thanos wanted to make the multiverse better, he couldn't understand why people couldn't see it the way he did and why they villainized him so - this caused his mental breakdown.. a Pure Evil wouldn't give a crap what others think, many would be very happy to be seen as the "villain" and even guys like Frollo would simply handwave the "peasants" beneath them, Thanos cared what people thought.. probably too much.