I'm a big fan of giving tailgaters the brake lights. I've also been known to move left and block if they try to pass unsafely. I don't care if they get themselves hurt doing so, but there is a good chance they will hurt someone else, me included, and allowing that would be irresponsible of me.
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"Let us hope our weapons are never needed --but do not forget what the common people knew when they demanded the Bill of Rights: An armed citizenry is the first defense, the best defense, and the final defense against tyranny. If guns are outlawed, only the government will have guns. Only the police, the secret police, the military, the hired servants of our rulers. Only the government -- and a few outlaws. I intend to be among the outlaws" - Edward Abbey