You are using “very conservative racists” and “differential racism” to explain something which is better explained by historical relationships and obligations. No such relationships or obligations exist with Syria or most of North Africa.

No country can invite everyone to immigrate. They have to be selective, and that doesn’t make them racist. No one has the right to immigrate to another country: it’s a privilege granted by the government and people of that country who make decisions about who to accept according to their own interests and perceived obligations - again, not racism.