I don't have much to say about the first point other than that is pretty disgusting. I really doubt its trump related though as the trump administration has been the most Jew-friendly pro-Israeli one we've had in years, pretty sure its just the media spinning it to forward their agenda, and no, I am not a trump supporter, I don't really like the guy but I do agree with some of his policies.
As for the second point, I really don't think Distrubed "can't" perform in Israel, many bands have (Sabaton, Megadeth, etc) and their reputation didn't take a hit, Sabaton even not only performed here multiple times but also openly endorsed Israel. And besides if anyone would take the chance to perform here it should defiantly be David Draiman who has not only criticized Roger Waters for asking artists not to perform here but also had the balls to criticize Lemmy, probably the most beloved man in the Rock and Metal community for collecting and wearing Nazi and Confederate memorabilia (A criticism that I don't necessarily agree with). That is really quite a ballsy thing to do considering the amount of shit it brought Disturbed's way so if they are really afraid to perform here that is quite confusing.