Never. The human race is too stupid, arrogant, ingorant and so on. We destroy to get what we want, we destroy just to live, we destroy for paper with a special stamp on, called money. Heck, we've let PAPER control our lives and we're juggling the lives of life forms who just don't care of our existance. Sadly animals would be destroyed just because they've let us think that we're superior. We are weak, useless, destrucitve and above all STUPID.