If people feel safer voicing their anger it could give the appearance of creating an adversarial relationship, but the anger comes from current labor practices, not unions. And, contrary to the misinformation that is currently being passed around by Lab management, workers will get a chance to vote on whether they wish to join a union or not, that is if they want to vote. There will be no union and no vote unless 30 percent of the members of any bargaining unit sign a card saying they wish to be represented by a union. So, my answer to your amazement that anyone would want to join a union, is that there are, no doubt, bad unions just as there are bad corporations and bad government agencies. But there also are good ones.
Unions are successful in many workplaces.
Just as one bad person does not make an entire race bad, one bad union does not make all unions bad.