That doesn't justify anything. A funeral is a time when the relatives of the dead are given the right to mourn the dead without interruption. If a hate group that is allowed to go around and protest funerals and pretty much make fun of the dead without any consequences besides being hated in the society, the kool kids klub should be legalized and be given the right to hate black people and verbally attack them.
Never said it justified anything, but they have every legal and human right to go and make fun of funerals without any legal consequences just like, yes, the kool kids klub has every legal and human right to hate black people and verbally attack them. That's what the entire concept of freedom is, everyone should have it, not just the people you think should. There's not a single thing wrong, amorally speaking, with them protesting like this. Yeah, it's cruel, it's a richard move, it's a publicity stunt, but that doesn't change the fact they should be able to do it.
Hate speech is just that, speech. You choose to let the words get to you.