Even after everything superman did The Batman still showed compassion for his old friend also his making Supergirl a league member was pretty cool.This way he can keep an eye on her.
“I miss the people we were then.” “Me too.” “I’m sorry Kara.” “For what?” “I couldn’t save him.” Superman didn’t deserve this. He was just a broken man who lost everything. Sure the Joker deserved to die for what he did, but there were other alternatives. Like sending him to the Phantom Zone as they just did with Clark. Of course we all know that it was Wonder Woman who manipulated Superman’s grief and made him do it.