It's ever so much easier to get them out than it is to get them back, it can be done with a single vote. If the choice was as easy in both directions it would not be so bad but many of these right to work states also demand far too many bullshit procedural opportunities for management to cajole, threaten, coerce, undermine, etc. before a vote can even be taken to unionize. Betcha didn't even know that did you? Bet you thought workers could just vote and presto, Unionization, oh no, my state demands a so called cooling off period between a first vote and a second vote where management gets to do all kinds of shit.