Well I guess we needed to be responsible members of the community in Social Media. Hate speech could also ruin our reputation as a human being insinuating violence or harassment.
Just a peace-lovin' person. Whining other people won't make you the greatest person ever lived. Thus screaming with hate will just make "them" create a fool out of themselves.
I get your point but you cannot rely on censors to enforce your philosophy. Freedom is more important than protecting men-child fragile little feelings.