The difference is that the government's actions are based on laws, which were passed by elected representatives and thus indirectly by the public. Not "forking over" to the government is the same as not paying a debt and claiming that you didn't personally agree to contracts being actually binding.
Maybe you're one of those idiots who actually believe you can have a functioning society without rules that everyone has to adher to even if they personally don't agree with all of them, but that belief does not make it true.
I usually don't bother responding to this sort of tripe, but it's so easy to prove you wrong that I couldn't resist.
The difference is that, if you really feel that taxes are such an injustice, you are free to leave. Voila, end of problem. Would that I had had that option when I was robbed at gunpoint at couple years ago.
Seriously, put your money where your mouth is and light out for that splendid anarchic paradise you and your ilk dream of so fervently. No one is stopping you and you wouldn't be missed.
What's that? There's no WalMart or fire department in Mogadishu? Bummer...