I remember reading something by Gary Larson about how he’d get in trouble with places like “Amnesty International” whenever he did a “guy in a dungeon” gag.  I’m a big old liberal hippie and all, but I don’t think gags like this are trying to make light of actual people who find themselves locked up in a medieval-type dungeon.  Besides, they obviously admit they were trying to rob the king, which is going to involve some sort of jail time if they’re caught.  Also, they were nice enough to give the guy on the right a footstool.