In my experience, most DMs run relatively low magic settings, where spellcasters of any level are extremely rare. I’m curious though, if that’s the case, how you deal with brazen murder hobo PCs? If your players threaten a village with violence to get their way, do you have high level Fighters as a check back? Are enemy spellcasters just as rare as friendly ones? I understand that high magic settings can get a little wonky when you consider the implications of various higher level spells on the economy, but I worry about players running roughshod over local authorities when even a 5th level Wizard is an astronomical rarity.