Because ignorance is bliss. But knowing your saving hundreds of lives a year by going vegan is an even more blissful and rewarding experience. <--- I hate this philosopher with a burning passion but I do like this quote here.
bloody idiots who just use the excuse 'because we used too' we used to use humans as slaves also. Using Neanderthals as the moral and ethical model for our behavior is a very elementary and foolish attempt to justify killing animals.