Does this question have anything to do with overseas-account tax evasion specifically, or is it just a general anti-tax jab? If you're against all taxation, then of course you wouldn't be against tax evasion either. But if you believe taxation is legitimate, then a concern for tax evasion also follows. (Whether this is a good way of dealing with tax evasion, where the pros outweigh the cons, is another question, but separate from the simplistic anti-tax slogan framing it as whether "the US gov't own[s] a person's income".)