Okay, sincere apologies on this, and doubly that that wasn't addressed faster =(
Just a few minutes ago - I've updated our global wikipedia data layer in production to be more assertive about what we are filtering. It still might not be perfect, but it's much more robust now.... You might need to clear you browser's cached data for the POIs to disappear immediately (see instructions below). Otherwise just give it a day or so and I believe the map-tiles will refresh on their own.
We definitely aren't trying to skew towards strangely controversial historic information -- it just seems that there is a natural bias that historic events (which in turn becomes wikipedia articles with geospatial data) tend to be bias towards negative or controversial topics (not an excuse, just an explanation). Soon we will add a Maps Settings window and users can opt-in to controverisal wikipedia POIs if they care to do so. But yes as of 5 minutes ago they are filtered out.
If you're still finding controversial items you'd like removed, please reply here and I'll resolve it this week.
Dylan
Kagi Maps Lead
You can clear your cache by opening Dev Tools > Application > Clear site data
(screenshot for chrome. I imagine it's similar for other browsers)

cc @OJD @RoxyRoxyRoxy @mrzv @jazzthief @Luis