I miss when villains could just be villains, and not be forced to have tragic backstories, or secretly turn out to be good guys. Or at the very least, not have them dwell on their backstories, and actually feel bad about what they're doing.
I can only think of one villain in modern fiction to be able to pull this off, and off well, and that's Micah from RDR2. Sure, it's not perfect, but it works, and was refreshing to see.
The thing is that he actually was tragic if you just looked at his character from start to finish. We've said this more than other thing in this entire thread: Eren has more than enough shit to make him a tragic character. The only problem is that the story fucking ignores it for no fucking reason.
Real talk here, Eren just needed one line of dialogue to fix this, and this isn't even me trying to dunk of Levi here when I write this. This could've actually been a nice callback, and have showed just how horrible the series' constant use of violence to solve problems is.
Eren: "Captain, you once said that some people just need a lesson in pain and a good beating. Turns out it's the whole world needs it."
It's cheesy af, but it would've gotten the point across way more than what happened in the actual series.