Why don't they understand that the MLBPA is the reason why the commissioner couldn't levy any punishment against Astros players for sign stealing?

I get that MLB players are mad that no player got punished for sign stealing. I don't understand why they blame the commissioner for this though. The MLBPA is the reason why he couldn't levy any punishment against the players. They made a point to make sure he offered the players immunity. If you have an issue with no punishments it's an issue with the MLBPA, not the commissioner. Yet no player dares to reprimand them for that.
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