If so, then you know that constitutionally and even ethically, the government is prohibited from detaining or segregating anyone on the suspicion of 'significant potential for violence'.
And even post-facto, many here on DU will argue that when apprehended, such criminals should be thrown into Supermax, lifelong solitary confinement, key flushed down the toilet, etc. What does that suggest about such people other than they have ZERO interest in finding out why such criminals commit these acts, how these individuals came to choose to commit criminal acts? Therefore, it seems to also suggest that many, even on DU, want to live in a totalitarian state.
What do we do? We find out what we can about these people, find ways to steer them in other directions. It's not at all clear to me that existing law enforcement agencies like the FBI or ATF failed, per se - people can snap, people can be on the fence, and one event can push them over the edge.
Peace, over and out. 
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