And the upright pillar of the community spray-painting bullshit on the side of a building is what? A downtrodden saint?
The way to protest petty bullshit of a criminal nature is not to engage in petty bullshit of a criminal nature yourself and try to claim justification because you're protesting.
That simply means you're an asshole who wants an excuse to act like an asshole.
So, asshole with spray-can or asshole with badge... Nope, both are still assholes, regardless of what they try to hide behind.