Your premise is wrong.

They cannot print as much as they want without facing consequences.

You are charged tax because there is some attempt to make the whole system sustainable, but over the years and the ongoing abuses (and temptations) of governments to continue to spend beyond the sustainability of the tax revenue, which includes their having had ongoingly borrowed against themselves and having to service their own loans with tax revenues, then they are ongoingly spiraled into worse and worse circumstances in terms of having to print more money just to keep the system going.  

It's not a good thing, and for sure when they are in their earlier days of printing a lot of money, they start to believe that they can print as much as they want (or at least that is what they say), but they may well know better and just pray that they will not have to suffer the consequences.  

If we did not pay any taxes, then the problem would be even worse, yet don't get me wrong, I am not even suggesting that there might not be alternative ways to go about this.. I am trying to describe the system that exists rather than some fantasy system that would be totally based on printing without taxes.. that is even more looney than the already existing system in which spending is going beyond income and part of the explanation for spending going beyond income is that the abuses of the government officials (or whoever the fuck is allowed to print money) have been going beyond their ability to even service their own ongoing debts... which may well have to do with either spending too much or not having enough revenue coming in in previous years... The problem is related to both income and spending.. not just income as you seem to be lamely trolling us with such a dumb question - not that I have not heard others (even seemingly smart people) asking the same dumb question.