You lose the moral high ground once you practice any one of those--at which point you're actively undermining your own message in the public eye.

Hell, your opposition will probably be accusing you of those things (or planting people who carry them out), anyway. Best not to cross that line.

Are murder, assault, theft, and vandalism acceptable to you?

Typically they respond by doubling down on whatever you're trying to get them to stop doing.