now deport their entire families
there has to be a deterrence that is too great , for the families, to bear . They will monitor what their children do much more closely , and prohibit this jihadism , if the entire family faces terrific costs . If not , then the countries are weeding out more undesirables anyway .
They won’t even keep them from returning from fighting for ISIS. They’re not going to deport their families.
This will not end well until lot’s more Charlies, Breslans, 7/7’s and 9/11’s happen.
Maybe then they’ll do as you say...