> why is it ok for a group of people calling themselves the government to force everyone to buy their services?
If you are in a country that allows you to vote, then you are the government. In most countries, you are free to leave. You can go to a country that doesn't collect taxes. Somalia, for example.
No, those who count the votes are the government. No, you are not free to legally leave most countries without being taxed out the ass. No, Somalia collects taxes.