Nightcrawler's Absence (as explained in the game)

I finished playing the game a while ago, and i was really dissapointed with the explaination that they gave for Nightcrawler's absence from the movie.
This was the main reason i played the game, and they really let me down. The explaination basically was that he is too much of a peaceful person to continue his life as an x-man. What is that all about? WEAK
anybody else have an opinion on this, or maybe I am misunderstanding whats going on.
I was kinda hoping for a really killer video game, and the story would just be an amazing experience where we knew how nightcrawler felt, and there would be a real reason for his leaving, i feel like it was a very weak cop out.
I did enjoy the game, I'm just a little disappointed in the Nightcrawler story.