Lisa Simpson's Presentation - Not every villain deserves a redemption arc. There’s a reason why they are villains.

Who needs a redemption arc when you can just throw pink hearts at people (this post was made by Kirby gang)

Yeah, it obviously depends on the context too. I think media aimed for younger audiences can get away with it a lot more. Though, that would also depend on if the character can be interesting while being redeemed and afterward as well.

For other characters, sometimes it is nice to see a well written villain slowly build themselves back up. But other times it's better to have it end on a more bitter note. Just because they're sympathetic or you can understand what they're doing, that doesn't mean they should get a free pass after they're beaten.

Of course, it's also nice to sometimes just get an evil for the sake of being evil villain to enjoy.