Absolutely. And I would fight for your right to express your feelings about said art, whether it be positive or negative, whether I agree with you or not.
What I have a problem with, in this case, is the alleged violence that took place.
As an example of my views, let's take the Westboro Baptist Church. You know, the people who picket soldier's funerals with signs that say things like "God Hates Fags." I think they're the scum of the Earth, and hate who they are and what they stand for. But I would never stop them from making their opinions heard. Control where they protest perhaps, so they're not taunting the family of the deceased, but it is their right to do what they're doing. As much as I despise them, I would go to bat to protect their right to free speech as well.