By far the best solution is to.... Make a non violent game!
I know this is heresy to most people, but i think that non violent games will end up being big sellers. The sims is a smash hit, and is totally non violent, ditto rollercoaster tycoon and sim city.
My best selling game is my non-violent -one StarLines INC, and if I was thinking of releasing it today I wouldn''t hesitate.
In a world full of shootemups like max-payne, I think we all need a calmer, more intellectual game for a change.
Ive always been disturbed by that "Im sorry did i blow your head apart" bit in UT.
http://www.positech.co.uk