Going back to what I'd said earlier, there are people who have the skill sets to engage people who are radicalized—like social workers, psychologists and stuff. They are already in society and might be better placed.
Again, the example I'll use is a school counsellor who has counselling training. They might be better placed to pick up where a kid is going wrong long before it gets to the level where law enforcement is noticing that the kid is going wrong. It's a very cost-effective way, too, to utilize those existing resources.
There are people in the community who know about this stuff and about what's happening with people who are becoming radicalized, long before government in general and law enforcement knows.