I hear "unions are always good" about as often as I hear "companies are your friend" ... rarely in both cases and of those times almost never as a sincere belief.

Peer Cyph0n is on the ball, save in the instances of the rarer and more extreme terminally corrupt unions - and even those mostly hold worker safety dear (albeit little else).

I would say something like “unions are more often good than bad and without them your children would today probably be working a 996 schedule”.