Because that part stood out to me and I think EnglishALT has done a good job of addressing your other points. My great grandfather fought in the same war and he probably wouldn't appreciate being compared to antifa or having the enemies that killed his comrades compared to journalists who are a little too far right for some people's taste. I'm not interested in defending Ngo beyond pointing out what a poor comparison that was on both accounts.
How do you think they started the holocaust? They didn't just one day say "Yeah lets kill the blacks, gays, jews and handicaps lol". They spent years spreading stories about Jewish folk covertly taking over the country (like Ngo does about Muslims) and made people afraid. They defended antisemites (like Ngo does) and published stories backing them up as being "just patriotic" (like Ngo does) and they turned up to Communist and Jewish areas and instigated fights that they then used to claim that the Jews and Communists were violent and anti German.
This is how it started before. WW2 didn't just start because the Nazis took over out of nowhere. They spent years doing it. Ngo is a modern day Goebbels in the making.
As for why AntiFa fight like they do, that's explainable with one simple post war paragraph from Niemoller.
"First they came for the socialists, and I did not speak out—because I was not a socialist.
Then they came for the trade unionists, and I did not speak out— because I was not a trade unionist.
Then they came for the Jews, and I did not speak out—because I was not a Jew.
Then they came for me—and there was no one left to speak for me."
It's not that he's a little "too right" for me. Eisenhower was a little "too right for me", Ngo is "wouldn't be out of place at a third reich newspaper" for me. He lied, about Muslims, to try and terrify mentally vulnerable people into rising up against a non existent threat from an oppressed minority. If he wasn't such a well known hack he could have done far more damage.
Edit: Also your back and forth was with him.
Until you replied to me. If you want to focus solely on a personal comparison to my brave grandfather's views on fascism then do it via PM, there is a far wider discussion here than your attempts to police a man you don't know's legacy.