If you’re in the US, Round 1 is a Japanese chain that expanded into the States a while back, and they brought a lot of imported stuff with them. Still a lot of gambling too, but keep walking until you find the section where they keep the good stuff.
You can also check Zenius-i-vanisher, a community-maintained database of what games are at what arcades. If you’re looking for a specific game, they may know a place. Just note that info on there may not always be up to date, double check when an arcade’s entry was last updated.
Depends on the severity of the offense. Don’t wait for Nazis to specifically start Nazi-ing in your community, kick 'em out ASAP. Anything less than that though, probably let it slide.