The Israelis have released drone footage of hand grenades and/or pipe bombs being thrown at their vehicles and troops. Multiple media agencies have shown footage of rioters using slings to attack the IDF and of rioters carrying knives and axes. Facebook posts from Hamas have been translated and released that show they were asking the rioters to carry guns and knives in order to kill or preferably kidnap Israeli troops and civilians. Hamas have admitted in interviews that the whole thing was designed to be a violent attack on Israel, not a peaceful protest. In my view all of that taken together pretty much proves the Israeli's case for them.
Somehow surprise isn't involved in my reaction to this.