Firstly, I personally think Harris' obsession with jihadism is obviously not healthy, and don't share all of his beliefs. I can kind of understand his desire to turn things into simple, moralistic equations in which case it's hard to get worse than jihadism if you're into a successful society, but fine.
Secondly, it was reasonably tongue in cheek, and was more about highlighting how bad both are, not forgiving one and not the other.
Thirdly, those comments have already spun up a discussion on reddit where folks are trying to show 'human shields' equivalence and (I regret typing this in advance when shades of grey aren't allowed) I do think there's a pretty big difference between what ISIS did with women and children and what the Nazis did towards the end of the war in recruiting, training and yes deploying underage boys in service.
Fourthly, and I can't believe I have to type this: jihadism is really, really f*cked up. So is Naziism. Both are stains on humanity, and I personally don't have a big problem with saying we'd be better off if literally everyone who believes in either is hunted down and killed. But for some reason anyone can say anything they want about Nazis and face no repercussions on today's world, but there are a non-zero number of people that get really sensitive if you say means things about jihadists. Not Hamas, not mulsims, jihadists. The murderous dealth-****. That's idiotic.
Anyway, none of that is the point. The point is this: if someone wants to argue that Jihadism has worse (or better) moral standards than other movements, that should be allowed to happen. You can disagree with it, you can argue against it but I hate this whole culture of glibbly tweeting a single comment or phrase. It's not discussion, it's 'gotcha' and it does nothing but make everyone involved look worse.