Damian is a ten year old and Bruce IS trying to get him to stop killing people. He doesn't even let Damian carry a sword, much less a gun. And Catwoman's stealing and Red Hood's killing isn't exactly on the same level.
Like I said, if there was a time when Batman was willing to say something about Jason's methods, establishing that it is in fact a problem for him, that he is now trying to work past, then that's something. There isn't, there's just this. The only flashback we do get is the initial Red Hood incident when Jason was full on villain, and in the nu52, would totally have shot Bruce dead if not for Nightwing's last second intervention.he has been pretty unfair to Jason in the past for his actions.