1) In a so-called right to work state, if you don't pay union dues, the union still has to back you up if you have a grievance. They're not "right to work" laws; they're "right to mooch off the union" laws. Aren't you Hundred Percent Red Blood Americans supposed to be against moochers?
2) If you don't want to join the union, you don't have to work in a union shop. Isn't that how it works when your boss is an asshole, your hours are too long, there's no vacation and the air conditioning is broken? (But not, for some reason, when a couple of Feelthy Queers want you to sign their marriage license.)