Why does it matter what the taxes are used for? Somebody with a gun says you need to pay up, doesn't make much difference to me whether that is an IRS agent who's funding the next bomber or a robber donating to starving African children, either way it's violence to take your life (labor) away without your consent.

If the robber builds part of a road or whatever with your money that doesn't make me feel any better about it. Especially if I'm at gunpoint an entire 3-4 months of the year to do it (30% of the year).