just that they serve no useful purpose.
at one time they may have, better working conditions, etc, but they are useless, nothing more than political machines.
Not sure that they really ever were worth the dues the workers paid in for representation.
Do you think that working conditions, that are now enjoyed in the US, just... happened? A study of history will reveal that they were fought for, by organized labor.
Your reasoning reminds me of a man who hired a security guard to stop the thievery that was going on at his property. The thievery stopped, so he fired the guard.