You could replace skin color with any attribute and it will probably happen. You can see it play out across the world time and time again, in any type of downturn or bad luck people on average find it easier to blame another group than themself. Take this a step forward and you get momentum to carve requirements that would exclude that group. Oh you want to participate in voting? You need to be able to list the Qur’anic commandments to be able to vote or whatever your flavor of restriction is.