[fziwhunm] Schutzmannschaft

Pretend the German Nazis (not to be confused with American Neo-Nazis) have invaded modern-day America and have recruited you (an American) to join their Schutzmannschaft to help them exterminate Americans, because the Nazis want lebensraum.  Which groups of Americans would you be happy to be officially tasked to exterminate?  (It wasn't so much the Nazis recruiting you as you gleefully volunteering for the opportunity.)

Inspired by acrimonious culture wars in America, though similar conflicts probably also exist in other countries.

Did the Nazis deliberately leverage already existing internal tensions in the countries they invaded to accomplish their mass murder?  (If so, that's bloody brilliant.)  What did they do to prevent internal conflicts from being resolved, the invaded peoples uniting as they faced a common enemy?  Maybe the internal tensions were so deep that nothing was necessary.  If true, it lends some credence to the (usually derided) analysis, "You only have to kick in the door and the whole rotten structure will come crashing down."  Although the whole structure did not come crashing down, large portions may have been induced to destroy themselves due to the "rot" of their internal tensions.

For which countries now would this form of leveraged mass murder be effective during or following a hypothetical invasion?

Inspired by "Come and See".