I’ll go first. Mine is the instant knockout drug. Like Dexter’s intramuscular injection that causes someone to immediately lose consciousness. Or in the movie Split where there’s the aerosol spray in your face that makes you instantly unconscious. Or pretty much any time someone uses chloroform.
The second one was even worse, IMO. It was so heavy-handed with its moral lessons. I suppose it’s not entirely unrealistic since many IRL socialist movements ended up horrible to the point of absurdity, but I was still rolling my eyes often when I played that game.
I agree that a good lesson would be that absolute certainty in any ideology is what leads to disaster but my impression is that that lesson is more sophisticated than what the developers had in mind.