Replacement theory in the US (there is a European version) is that latinos and muslims are being brought in to replace white people.
So, if someone believes in this, it causes you to shoot black people?
That is ridiculous in every way.
When they move in next door, I don't care what color they are, I don't want to hear their stereo at 2:00 a.m.. I don't want them parking to block my drive then getting nasty if I object, I don't want them throwing trash on my lawn, I don't want to hear their friends out front laying on the car horn at all hours, I don't want to watch their drug deals at all hours... etc. Cultural... see?