Taxes go to help an (imperfect) tradition do Good Things(TM) that *can't be done any other way*, but should be done. And also, that tradition is open to criticism, and thus improvement, and is actually the only feasible path currently available to a good, tax-free society. Now, being coerced by taxes requires an active "I don't want to pay taxes" theory while paying them. But one shouldn't have such a theory, because taxes are good. And thus taxes only coerce (in the TCS sense) people with hangups.
Laws are to create consent, just like rules in boardgames. Consent over what? What society should be like. And why should society be like anything, instead of just every doing what they like? The same reason that a chess board is more fun with rules. Because autonomy of action is pretty damn worthless; creating and realising good purposes is valuable.