after St. Louis police unions instructed officers to publicly display The Punisher's insignia (the mark of a lawless, fascist murderer) the comic book community was quick to point out the stupidity, and the frankly horrifying message sent by supposed peace officers endorsing a maniac. So it's a good thing The Punisher personally confirms he hates cops who see him as a friend… making every cop who "wears his mark" or calls themselves a "fan" look like shameful fool in the process.
-- Andrew Dyce, The Punisher Confirms: He HATES Cops Who Support Him
Has he ever been portrayed in comics killing fascists?
I haven't actually read any Punisher, but it sounded more plausible than The Punisher being fascist
I haven't read a lot, but it would be interesting to see how corporate comics would write an 'antifa' Punisher. They would absolutely slander the movement, like with the Joker (Johann Most + L'Homme qui rit), the Flag Smasher, or Anarky. But it would still be a curious read.