How do think this scenario would end? Would police even respond?

I don't know how it would end, but it would begin with an "s" (cenario) and more than one Karen would be "kill" not "kills."  

Where is Randy when you need him?

I think it would end like this - After the 2  Karen's commit the mass murder they notice a blank man on the corner holding a box of cereal and minding his  own business.  The Karen's call 911 and say officer there is a threating looking black man standing on the corner holding a box of Trix - Trix are for kids so you better get down here right away. The cops are there within 2 minutes and they arrest the black man. Cheers!

Of course they would respond. Whose side do you think they're on?

Aren't "Karens" racist, though? Maybe it was a business transaction gone wrong. Perhaps the "Karens" were the "evening entertainment" and things got a bit rough, or the supremacists/militiamen didn't want to pay. Are you sure you gave us the entire fake story? 

That's not a crime, it's a public service. White supremacy is akin to Nazism, thousands of Americans (and Australians) DIED fighting against that crap.
Anybody who finds him or herself in close proximity to a fascist has a moral obligation to punch them right in the face. This post was edited by Slartibartfast at June 17, 2022 12:10 PM MDT