My implication is different (altho I agree some people use it as a racist argument). My implication is that social cohesion policies are not easy when you have a ethically diverse population with different cultures and values. It's perfectly natural for people to form into groups and not trust 'others' (which isn't racist). This natural tendency makes it hard for social policies to be successful. When 95% of your population is white, with similar cultural values, its easy to have a policy where you spread the wealth to fellow group members you identify with. It's a lot harder to have policies when your population is split into 3 different camps.