Riddle me this...........?

Why would a person spend their time trying to change another's belief in God? Namely the atheists on here who crowd intelligent questions with negativity and self-importance. Do they realize what role they are playing? Isn't it really a desperate attempt to find validation of their own wobbly beliefs - Stepping on others to feel taller? There will surely be some childish and/or fearful replies, but as the saying goes.."Two wise men will never argue, A wise man and a fool will never argue, but two fools will ALWAYS argue."