What do you think would happen if taxes weren't forced upon the people? Yes, that's right, no one would pay them. And what would happen if the government is broke? No military, no roads, etc. The economy would collapse.
What you fail to take into account is the selfishness of humans. Most people would rather contribute to their own well being than to society.
For your information, private industries are always the ones that succeed, not government run ones. And we aren't discussing taxes, we're discussing how much we have to pay for NASA (NASA taxes if you will).


