[bots]

it's simple laws of physics that if you add to much of something too quickly, you upset the equilibrium, so in order to avoid that, you fit a valve or a tap, add a drainage point etc etc

The same is true of cultures. If you swamp a culture it will get eroded. The only way to avoid that is to discourage ghettos and control the rate of entry based on what maintains the equilibrium.

I don't see how that is difficult to grasp and it is in no way racist or prejudiced to insist on that method of controlling the equilibrium.