I care how much taxes I pay for several reasons (Germany):

• Rich people are taxed less than working people
• Given that we have one of the highest tax rates in the world, a big part of my taxes go into corruption, incompetence or the pensions of civil servants (pensions for civil servants are way higher than for normal people, especially for some pencil pushing)
• It gets even more fun, when I think about how many big companies are getting subsidized by my taxes with billions (speaking about companies which are making billions for their stake holders)
• In our system, costs for health care system and workers pensions are also mandatory deducted from my income (they don't call it tax)... Given, what an average worker pays, we get not enough out of it, neither from health care nor when thinking about the pensions
• A final tax, which is not called tax, is for public TV/state propaganda. There were more scandals about that money recently than anything else: The higher ups in that system earn more money than the president of Germany (no kidding), people get special pensions for the rest of their life which are obscenely high (after working like a few months, again, no kidding)

Don't get me wrong: I would happily pay taxes if the biggest parts would go towards services, infrastructure, public transport, health care, people in need and smart/strategic investments of the economy.

As it is right now, my taxes are siphoned into the pockets of the so called elite instead , so I care.

If you don't care about paying taxes, you are either mostly happy about were the money goes or have too much money to care.