I think it's mostly nothing to do with religion or Islamic Jihad in general but purely on the humanitarian basis of a cornered people being crushed into the dirt by a technologically superior bully. In other words it's support of the oppressed Palestinians as a people, not a religion thing, or support of Ukraine which was minding its business when a giant bully started savagely attacking them and stealing their land in the middle of Europe. At least in Israel's case they WERE attacked first. The left is definitely not pro jihad but it gets spun that way. Many have no idea what jihad even is, even Muslims have different definitions.