Palestine is sacred land that was colonized by Britain and handed over to create Israel. Israel proceeded to displace and murder large numbers of people to give birth to it's creation. It is a colonial project. Westerners do not understand the meaning of this. Mecca and Jerusalem are significant to a very large number of people. Whether or not they are irrational for believing this is besides the point -- it is a material reality.
These are just facts. I'm not the type of person that debates whether or not something is morally justifiable or not.