What do we mean when we talk about "homegrown extremism" or "radicalization" in the United States? Donald Trump claims that the threat of "radical Islam" is imported by immigrants from abroad, from regions where there is a history of terrorism against us and our allies. He refers to " thousands upon thousands of people" entering the United States, "many of whom have the same thought process" as the Orlando, Florida, shooter. He asserts that they are forming "large pockets" of people who want to "slaughter us."
Actually, we don't know the motivations of the Orlando shooter, and we probably never will. We certainly do not know what thought processes immigrants might bring with them as they travel from the "many more Muslim countries" Trump mentioned earlier this week (the short list - in addition to Afghanistan, Iraq and Syria - would include Indonesia, Pakistan, Saudi Arabia, Lebanon, Jordan, Algeria, Tunisia, Morocco, Egypt, Libya, Somalia, Mali, Niger and Nigeria). Many of these potential immigrants might be fleeing jihadist violence in their home countries.