I used to enjoy playing Escape from Colditz when I was younger, and I never hesitated to use the ‘Shoot to Kill’ card to stop an escapee.
Its never come up but I would not take part in a game that was too close to some actual past horrific events some of which others above have already mentioned.
I do find it a little strange that so many will not use “SS” designated ww2 forces as many were simply normal military formations. Of course certain units with specific histories should be avoided as per my previous comment.
Pure fantasy stuff like zombies etc would not bother me at all though.
Its really all about making that destinction between real life and games, when the two get close it can become uncomfortable.
Interest include 6mm WW2, 6mm SciFi, 30mm Old West, DropFleet, Warlords Exterminate and others!