If atheists are correct, and the universe is only an accident, as we are, then why would morals and laws?

even matter. Since life has no meaning and the universe is uncaringly neutral, why even have morals and needless responsibility? Why spend what little time we have getting educated or doing anything for anyone other than ourselves? We just simply go to the ground and rot. Why not be anarchists? Don't reply with you care about the world or others. That is an obvious lie. Why would you? You will die and become nonexistent. Why would you care? If we are here by some mindless accident, shouldn't we correct it by going out and destroying it all? Don't you usually clean up an accident? If you are right, then nothing matters whatsoever. If you say that it does, aren't you being a huge hypocrite? If we are nothing but higher evolved animals, shouldn't we be getting the most out of this short and meaningless existence by taking whatever we want? In the end, it only ends in oblivion, anyway. What say you?