The thing is, if taxation isn't theft then why shouldn't the government do as much of it as it wants? Why not just tax the people at 100%?

I think we actually get to a proper statist view by seeing taxation as theft, thus an inherent badness, which is only justified when the people are represented properly and the government respects their needs.

So I hear this language as a perfectly reasonable call to examine the balance and see if we're being heard and getting our needs met in exchange for the sacrifices in question.