Actually, if it were proven that we are all just animals with no more value than any other animal, I can assure you that the world would fall into complete chaos. The only reason there are laws or values not to kill, steal, commit adultery, molest children, lie, cheat, or many others is because we hold ourselves to a higher morality than the animal kingdom. If we were just mutated apes who only have feelings and consciences because of some random chemical bursts, then what separates us from the laws of the animal kingdom such as kill each other to protect our turf or to claim a female, steal from others to feed ourselves or our families, sleep with multiple partners not caring about the feelings of our current partner, have sex with children as soon as they are old enough to breed no matter how wide the age gap, and every other action formerly considered "Sin". Who would decide the laws when everyone decides for themselves what's right and wrong? For instance if marriage is changed from one man and one woman to accommodate two men or two women, then why not one man and 2 women or one woman and 2 men or 2 women and 10 men or 5 men and 100 women or any combination of men and women. Or why can't pedophiles get rights to be with children if the children agree to it? They are just animals anyway so why should they have rights? Would you keep a tom cat from mating with a kitten? And then why can't a human mate with an animal? We are all animals anyway, where is the natural law that tells us we can't?
If morality goes out the window, what kind of world will we be living in? All groups will fight for rights to live according to their own fetishes, claiming that it's who they are and you have no right to discriminate against them. God gave us laws to create order. Everyone thinks differently and if everyone has the right to live as they wish, that is chaos.
The philosophy of the Church of Satan (who claim to be an atheist organization who use the name Satan to represent anti christian philosophy)
is that we are all nothing but animals and therefore should revert back to our primal instincts, only thinking of ourselves and only helping those who are strong and deserve our help and weed out the weak. This is the philosophy of the survival of the fittest and what we are looking at if we shed our Christian influences and create a completely scientific society. The Book and movie A Brave New World is about such a scientific society and very little of that book is yet to come to pass, it describes the world we are living in almost perfectly. The only thing missing is a dictatorship with forced sterilization and government control of reproduction but it's the logical next step in the fight for population control which is now controlled by pro abortion propaganda...