50% is just a number. By even your own definition paying 1% would be theft if it's done against your will. But this is a democracy, so you do have a kind of choice in the matter.
Also - a way to think about high tax full-service countries is to think of them like an all inclusive resort. It costs more, but the drinks are free.
It's significant because that's the point at which the govt is getting more than you for your work. That's why it feels wrong to many, and is not just like any other number.
