Why do we need morals?

[Angrboda]

I think those who purport moral subjectivism only do so based on their own latent sociopathy, but I personally don't endorse "morality" at all.

Why should a grown and rational person do so?

Morality for me is just a fancy word for "feels right". Now, what "feels right" I believe is determined by the society we were brought up in and is ultimately the product of a lot of superstitions and dogma, Christian or otherwise. Thinking and reason can and will lead to different morals than those we have today, albeit of course only over the course of generations. Then what "feels right" will be more in sync with what our reasoning tells us is logical. What is "right" basically boils down to treating others as we would like to be treated ourselves. This is a sound rational basis because it is impossible to prove that my own desires and wants have any objective, reasonable precedence over the desires and wants of any other being.