Mind crapped npcs are those who got possessed by the mind flayer mutant , then , there can be poisoned traitors that are poisoned by gas grenade , and also there are who got scared , and they turn into traitors.
The items that cause this can be the warhorn or the trumpet( mostly with heavy class and mostly only scares weak NPCs like sworders or gunners/luggers or rioters ) , and also the gas grenade and the injector ( not directly but through mutant ) or infectionist gas ( also through mutant ( mind flayer mutant )) , also, some NPCs like mind flayers can turn into traitors.