Why can’t you delete Comments on your own posts?

Edited: this wasn’t a post looking for people’s advice! This was a family post my husband put up in glows couples because you have to choose a topic or you can’t post things on your own page otherwise he would have just posted it just on his page..he put up a pic of me saying how much he loved me and a woman with kids was a rube ass for no reason commenting on my looks with a GIF ..I just wanna know when you post something why you can’t delete comments on your own shit..you can only hide the comment which only hides it for you but other people can still see it..

there’s not a single situation on this planet that gives someone else the right to be rude to people for no reason just because they want to be a dick!