Hacking in this form is pretty much the computer version of acting like a child.
"I don't like their opinion, so I'll make it so no one can hear it." If you don't like the website, or the people, just avoid it/them. There are plenty of more mature ways to go about expressing your opinion.
I guess if someone commits a crime against someone you don't like, it's OK. By you guys' same logic, it's OK for them to protest at gay funerals, because they don't like them.