I think its a bit odd that fellow muslim-dominated nations don’t jump at the chance to help their fellow Muslim bretheren and presumably do their duty to their faith unless my inference is correct and this is not a religous/racial issue so much as geopolitical and sociological issue.
Idk about other Arabs, but at the very least most Egyptians would jump at the opportunity to go and free Palestine from Israeli oppression (or actually do anything other than watch), but the government is allied with Israel. You'll likely see Egyptian policy towards Israel shift drastically if the current regime changes. I imagine it's similar for many Arab/Muslim countries.