Definitions of 'fair' aside, that is absolute ********.
I could wheel out about a million contradictions to your statement, from nurses to footballers, but I'm sure you've heard them all before.
If you want your 'fair' to be a flat rate for everything, then wages have to be included in your flat rate - it would be unnatural not to include them.
Nah. Sorry to say it but you're wrong.
Everybody costs the same to police and collect their bins. They don't all put the same effort in to do their work. If a business want's the best people, they will pay more for them. If you want to earn more, you become the best at your chosen field or skill set.
If you want to collect bins and put no effort whatsoever, you earn less. It's not rocket science.
The loony lefties would kick up a right fuss if the "fair" method of the current income tax system was a flat rate 33% of your earnings across the board. The more you earn, the more you pay.
But then to do that they would have to sacrifice their own benefit of crying about this "social equality"... Only equal because their better off in their own tiny bubble.