No shit, but property rights are equally predicated on violence. Land is free to all by nature. People build fences and enclosures and use violence and the threat of violence to drive other people off "their" land and enforce their exclusive right—actually, States enforce those rights. My point is, don't complain about taxation being theft unless you are equally opposed to private property...because both are predicated on the threat of violence. Both are ways of extracting wealth from other people through violence or the threat of violence. By monopolizing land and natural resources (means of production), owners of those resources exclude others. Consequently, the dispossessed end up having to work for the owners of land and resources in exchange for wages in order to survive. Wage-slavery is predicated on theft, enforced by private property privileges enforced by the State. If taxation, then, is used to steal from the original thieves (those with private property allowing them to accumulate unearned income) and redistribute some of their wealth into the hands of the dispossessed, then taxation is no longer theft but rather justice.

Personally, I think private property makes society better off, so it is a necessary evil, and consequently I think we ought to embrace the institution of private property but also use fiscal policy to mitigate the negative effects of it. (Cf. Thomas Paine's "Agrarian Justice")