I agree. Taxation is legalized theft.
If I were to mow your lawn without asking you, present you with a bill and then threaten you to pay, of course that would be consider an act of coercion. Taxes are no different than this.
Basically a room full of people get together, invoke political ritual and all of a sudden the theft is ok because it was passed as "legislation".
Nobody is against feeding the poor, having health insurance, employment insurance, pensions, etc., but ALL of these things can be provided on a voluntary basis by privately competing organizations.
Bitcoin may not change things on it's own, but I believe the idea of crypto-currencies in general will.
When evading taxes and the punishment associated with it becomes as easy and risk free as downloading mp3 files everyone will do it. No more stuffing cash under your mattress to avoid leaving a paper trail. Just use an anonymous coin and be your own bank. Nobody will be able to tell how much money you have!