This Just Came To Me. The Joker Is Right. (Spoilers)
So everyone is pointing out that Kylo Ren can't redeem himself for killing Han. Well, let's break down something and re-word it using a Joker quote, which proves the Joker quote to actually be right about society.
Anakin/Vader kills off a bunch of younglings/children in Episode 3 (Joker talks about blowing up a truckload of soldiers or some gang banger). No one makes a big deal out of it and applauds Vader at the end of Episode 6. Plus say he redeemed himself.
Kylo Ren kills Han Solo aka ONE GUY and someone important (Joker's example being the mayor of Gotham). Everyone loses their minds and says there is absolutely no way Kylo Ren can redeem himself.
So it's okay for Anakin/Vader to kill off a bunch of kids and be able to redeem himself, but Kylo Ren can't redeem himself after killing just one person? Han Solo was my favorite character, but killing off a roomful of kids is a little more serious. And at least Han Solo got to have a life. Those kids didn't. Anakin/Vader took that away from them.
Me personally, I don't think either of them are worthy to redeem themselves for what they did. But at least Kylo Ren didn't do something as serious as Anakin/Vader. But it looks like The Joker has proven himself right about what he said.