It hardly seemed possible for Israel -- after its brutal devastation of Gaza and its ongoing blockade -- to engage in more heinous and repugnant crimes.
I don't particularly care what Glenn Greenwald has to say about this. There are people who are invested in fate of the Palestinians, and most of them are Palestinian, not professional commentators whose authority comes from unrelated associations (as with Salon.com, a "law degree," or an ability to communicate well).
If Glenn Greenwald wants to be a go-to authority on everything topical because he is already in a position to do so, I don't necessarily blame him, but I don't particularly care what he has to say about issues that are beyond the realm of his own experience. No Palestinian in the world would ever make the statement that "it hardly seemed possible for Israel to engage in more heinous and repugnant crimes" when that has been the status quo for over half a century!
What this indicates to me is that reading Glenn Greenwald on the Palestinian question is, to a certain extent, a waste of my time; I could just as easily be reading the Lebanese writer, As'ad AbuKhalil, who surely has more stake in this than someone who is writing just to be relevant, pursuant to his career as a commentator. If I was really serious about the Palestinian question, I would find the English-language Palestinian writers who are actual authorities on these questions; I would not take "the scoop" from Glenn Greewald, or people like him, because what they have to say about it is meaningless absent other perspectives.