Most people would express their feelings anonymously by hitting a punching bag. I don't get going to all the effort to paint your roof with a sign you don't want seen. To me, that's mental illness. Get in a car, drive around screaming your head off. Or punch the walls in your house. But advertising it is advertising it. You can't have it both ways.
But hey, liberalism is by definition insanity. Thus your assessment is correct, though I do not think there is a court in the entire world that would find him mentally incompetent.
Oh, and I have strong suspicions that he hit something the night that Donald Trump was elected President. Hopefully it was just the bottle, and not his wife or the pets. 8>)