“because otherwise government services are seen as free goods”
I think this is a really good point. If everyone shares the tax burden, people will stop using government services except when absolutely necessary.
Sorry, but you're thinking like a conservative here. Use auto insurance policies as an example, instead. Folks like you and I really hope we have nothing to do with our auto insurance companies besides watching them cash our premium checks, and issuing us the pieces of paper we may need to show to the authorities.
Liberals tend to feel that they are entitled to get some sort of "return" for the auto policy, even if it's to phony up a claim for a kickback from their brother-in-law, the auto body shop guy, or at least a free tow or two a year for a beater car that really needs to be replaced. That's what would happen in the minds of the libs when they start getting taxed. We should have never let up on them in the first place.