I think there is such a thing as socio-economic cultural quarantining to protect your kids from bogans.

Nothing to do with race whatsoever.

It is likely my DD will go to a private school because most of the public secondary schools in this area are full of ferals.

Am I quarantining her from their influence? Absolutely.
TBH, this is me. Its either a small public school, or private for me for this reason. I've not lived in an area where there are many emigrants, but I don't think that would sway my decision nearly as much as the type of people who's kids attended that school.

My excuse - I don't want my 9 year old daughter asking to go to so & so's house, then having to come up with an excuse as to why WITHOUT letting my child know the real reasons. Drug dealers/alcoholics etc... I've grown up in area's where parents lock their kids outside while they get high. I've seen a 14 month old & 2 year old wandering the streets coz they were locked outside alone. We knocked on their door, tried to open it. 20 minutes later the father comes out looking for them.