Yeah i agree with sensei, the concept of ummah is a noble one and shouldn't be spit at, mocked or ruined just because of a selective individual selfish human beings, who act solely on the basis of the their own self interests.
But we also act on the interest of our people. We wouldn't want hundreds of thousands of Syrian refugees in our land just like we don't want 500 000 Muslim Bantus in our land either.
Ummah is a noble idea if Muslims collectively actually cared for each other but it's quite evident that's not the case at all. Everyone for themselves.