Because if you are not paying your fair share then you are stealing from those people who are,

People paying extortionist, or slaves obeying a slave master, does not justify an extortion racket, or slavery. It does not follow.

The quality of the air, does not justify extortion or slavery. It does not follow.

If you don't like it here you are free to go whenever you want and also free to try to change it.

Me not going does not justify extorting me.
Having the "freedom" to change an extortion racket or slave system does not justify the system.

If you don't pay you should have your wages garnished.

That is your opinion. And maybe the opinion of millions of others that does not make it right.
I don't have wages so they can't be garnished. What if I worked black and keep my money at home.
What do you personally advocate should be done to me personally if I don't pay the extortionist (to pay for your extortion service) of the political ruling class. Please be literal and specific.