It seems to me that you're skipping over a couple of very important elements of this quote.
How can you expect "voluntary support" of unjust laws which were not formed by persons "of their own choice?"
Law should be a scintillating diamond condensing and reflecting all the best qualities of human nature and society. The law books should be as thin as they were 150 years ago, where a bright sixth grader could, with a little thought about a few basic principles of human interactions, write out essentially all the criminal laws in force.
But now, look at where we've ended up instead! It's physically impossible for anyone to know exactly what's legal or illegal now. Even Congress doesn't know! See the first video at 5:17 - "The congressional research service can no longer even count the current number of federal crimes..."
Understanding this distinction lies, I think, in a reading of John Locke's discussion of "Natural Law" - law which incorporates and reflects, in the words of Dr. Martin Luther King, "the moral law or the law of God."
There's a legal maxim: lex iniusta non est lex - "an unjust law is not a true law." And I think that's what the folks from Keene are trying to illustrate when they offer the police the opportunity to refrain from using force and violence against their peaceful, but "illegal," actions such as giving a manicure without a license, or drinking a certain type of beverage in public, or smoking a certain type of cigarette in public.
Would it not be salutary to the health of our liberty and our Constitution if we could get back to the days when all the laws of New Hampshire, for example, would fit in a single volume?
They're violating just laws formed by the citizenry. They've chosen to walk around naked with open containers and lit joints while spewing obscenities to demonstrate their contempt for their neighbors, the law and society generally.