Hera doesn't deserve the hate. Zeus does. Hera actually cares for demigods. She cared deeply for jason and you could see that in toN. She did do a lot of bad things to demigods but she helped them a lot more then most gods and she had good intentions. Not to mention she is constantly abused by Zeus. Imagine your husband having such little respect for you the godess of marriage that he cheats on you. And we forget that Zeus had an important role in the reason the people hera killed died. He knew if hera found out they would die but he did it anyways. And though what she did ain't right lots of other gods murdered innocent people hera definitely isn't the gods who killed the most people.