There is an old lawyering adage that says “If the law is on your side, pound the law. If the facts are on your side, pound the facts. If neither is on your side, pound the table.” It also has an alternate ending which says, “When neither is on your side, pound your opponent.”
— Read on mises.org/wire/public-labor-unions-are-getting-desperate

Some unions are good, others, not so much.