Muhammad Ali & Mike Tyson both converted to Islam. And yet they are descended from people present in the US for many hundreds of years. Of course neither of them were ever terrorists.
We are now seeing a type of terrorism whereby many people are getting radicalised and converted domestically. It's not necessarily always immigration.
Its the ideologies, more than the people, that need to be targeted & counter-acted.
en.wikipedia.org
Smith, who gave birth to a daughter in Islamic State territory, bought a one-way ticket from Dublin to Turkey and crossed the border into an IS-controlled area of Syria in 2015.
news.sky.com