This is the biggest issue... the writers got really lazy and stopped developing Gambit's character after the trash that was "The Trial of Gambit" 
(which was organized by a man that's slaughtered plenty, at that...) and he hit a metaphorical wall.
 
And turned into the wreck of a character we see today. They never let Gambit's story flesh out, never let him have a moment where he forgave himself, or at least came to terms with his past and moved on emotionally. We've just gotten the same stupid story re-hashed. And, of course, Rogue. 
