One of the fundamental aspects of their opposition to Israel is that they think Israel is morally obligated to stand still and do nothing in response to Palestinians shooting unlimited rockets at them. If you press them a little you can even get them to make the argument that it's okay because the rockets aren't very good. Just totally incoherent, insane freaks.
The exact same people who don't mind foreign/spiritually foreign communists tearing down statues and monuments pitching huge screaming fits about White House renovations would be funny if they weren't all genuinely, dangerously insane.
Performative, exaggerated leftist wailing isn't the only way people grieve.