[r3vbr]

Neither animals nor humans have intrinsic value. If humans had intrinsic value, then we would try to have most babies possible, but birth rates are decreasing so we clearly don't value that.

Also, we will do with animals whatever we want because we hold a position of power. Killing humans is considered wrong by simple game theory, if killing humans was considered standard, then the odds that I would be killed would grow. Since I am rational, egotistical and with aim of self-preservation, I will make an effort to make killing humans be outlawed. Same thought process occurs with everyone else in the population.