They commit suicide because they can no longer function socially in society. They commit suicide because the conditions they've been in has poisoned them so much that they're in constant pain with various injuries and the care they receive is worse than degenerates on welfare get for free. They commit suicide because during their deployments, their wives cheated on them. They commit suicide because they realized too late that they were fighting for the enemy instead of against. The gangstalking isn't necessary.