If the capital contributes a lot more than the worker, than why shouldn't the capital be taxed far more than the worker?
The capital WAS taxed far more than the labor. The labor's value was << the total value produced, and presumably was also taxed at 10% (so it paid ~0 taxes). 10% of the capital was also taken by the government in taxes - 10/100 of the car replicators were appropriated.
When you start taxing the capital income, then an EVEN LARGER PROPORTION of the capital is appropriated - 19/100 - versus the same 10% of the worker's labor.