Right-to-work laws are like prop 13 in California: sounds good on the surface, but hidden terrible impact.
On the surface, "I should be able to choose whether or not I join a union" makes sense, Americans love freedom and choice. But of course, in practice people who choose not to join a union get to freeload: they get most of the benefit of the union in how it informs a company's general policies and culture about workers, but don't have to pay any fees. And like most instances of the freeloader problem, the result is the responsible entity getting starved, as everyone wants the others to be the ones paying for the benefits.