This is a problem

If only half of us pay taxes then the other half can vote themselves the use of our money.

I don't think we should be taxing people with relatively small incomes, but for half of the "tax payers" to not pay any income tax is a problem. This approaches the level of theft. If you can vote to raise taxes on the wealthy in order to provide benefits to yourself, without having any skin in the game, there is a problem.