And yet there's a 50% tax break for capital gains in my country. What possible reason is there for such a massive subsidy for something that we don't need, other than corrupt influence on the political system by the wealthy to give themselves a tax break?
Letting you keep your own money is not a subsidy. That being said, labor and capital should be taxed at the same rate, there being no reason to distinguish them for tax purposes.
While this is semantically true, reducing taxes as a vehicle to put money in the right hands is by all means a subsidy.