Although I agree with the Gramp, but I also don't agree fully. There are types of villains. There are the ones that can redeem and the ones that cannot redeem. There are the ones that are forced villains and there are the ones that became villains to do absolutely horrbile things just for the fun of it. At first I too wanted them all to die, but had some doubts about it as not all villains gives off the samw vibe. So, I think the ones that are redeemable should redeem because if you kill them, they would just die without any struggle, but if you let them redeem, they will have to struggle make amends for what they did. Killing them or letting them live won't bring back anyone, at least if you make them redeem, they would have to struggle to make up for their mistakes just like everyone instead of killing everyone to not face their mistakes. This depends on who has the strength to do it. To do something like this one has to have a next level determination and resolve AND power cause you gotta fight them or overpower them to even get to talk to them to reason. Or just be strong and reasoable and talk while fighting.
(This is a lot of yap am doing under a manga, but I gotta say it somewhere.)
(This is a lot of yap am doing under a manga, but I gotta say it somewhere.)