You created your own argument here though, right? I can be an advocate for any of one million serious problems that our societies have. Should everyone go destroy art galleries? Housing crisis = art destruction? Unliveable minimal wage = art destruction? Car centric societies = art destruction? Local store increased prices = art destruction? You have to agree that at a certain point this becomes indistinguishable from vandalism.
At what level then is this threshold? Or do you propose a hierarchy of ideas, which are suitable to protest in an art gallery, versus those that aren’t?
Well I agree with the problem, but I don’t believe attacking art galleries is a solut. Why not spray paint a real estate firm?