Comment by joshlemer

You say that I gain all the benefits from collective bargaining but I had no other choice. Maybe I don't even like the contract very much and would have bargained for other things than what the union negotiated for. The union claims to negotiate on my behalf but if they really respected me they would give me the ability to opt out.

Your hypothetical isn't even always the case. When unions form, usually there are employees there that don't want to subject themselves to the union, but are forced to, so they didn't "join a workplace with a union" at all.