It's fine to say you did something cool because you could, in fact the coolest things are done just because. Adding commentary that it was a protest for stolen / wasted space, spare me the minutes please
Go read about the Paris Commune, Villa Road, Pieds Plats, Frances Street, or that group who squatted in NYC until the city capitulated and turned the buildings into low income housing.
What evidence do you have that they aren't genuine about their reasons, given it's not at all uncommon for squats to exist as a form of protest?
Art can exist for the purpose of protest. Art can exist for the purpose of profit. Art can exist "for the lulz".
Who made you the arbiter of art?
Jeez, you'd look at Guernica today and complain Picasso was an SJW with an attitude like that.