If you block emergency vehicles and someone dies or gets (more severe) injuries you should be prosecuted.
Generally the art vandalism just makes me feel aversion towards whatever your agenda is. But I'm not sure if I'm your target audience in the first place.
If you block me while I'm working, turns out I'm paid by the hour anyway. If you block me on my free time I'll probably work up a rage and actively start opposing your agenda instead of listening on what you have to say.
Over all you'll probably not convince me.