I hate to break it to you, but Greenwald is just another "I was a teenage leftist" Republican getting ready for his book tour. He's been pandering to Trump supporters for a few years now...
He's a terrible example to cite if you want to support the actual left.
I mean, he has started spreading TERF propaganda on Twitter (because those particular brainworms always infect the new converts, for whatever reason). That and the Trump thing aren't minor ideological differences - they're fundamental, irreconcilable conflicts. There's no future for them.
He's a terrible example to cite if you want to support the actual left.