If you felt that your ISP didn't give you the proclaimed service, you could always cancel your subscription and sign with another ISP.

I do agree that the idea of taxation is not theft, but at what point does it become so? If you look at all those aspects that you point out, would you say that the taxes are well spent? The other issue here is that the people in question don't even live in the US, and thus don't make use of those services (and probably don't want their money to be used on foreign wars, as well. Just an educated guess).