Yeah, I like how it informs his redemption arc and guilt too. I wouldn't want it removed from his history. I do agree with y'all that the X-Men were too hard on him over it, but that is nothing new. Magneto, Emma Frost, and Namor(how many times has he atttacked humanity?) received less grief from the X-Men than Gambit did over his involvement in the Massacre and his general status as a thief.
Anyway, I am not the greatest at photoshop, but I like to dabble and have fun with it every once in a while. Here is a Gambit collage I had fun making and just finished(be as harsh as you want on it, ha)-
I just wish I could have managed to fit a Lee Weeks Gambit on there.