Getting to the bottom of 'known' terrorists

I feel as if I'm experiencing a terror-related "Groundhog Day."  In the aftermath of nearly every radical Islamic terrorist incident, it seems we learn that the perpetrators were "known to authorities" or "known to security services." The Tsarnaev brothers (Boston Marathon bombing), Major Nidal Hasan (Fort Hood), Syed Farook (San Bernardino), and Omar Mateen (Orlando shooter) were all known to authorities, as were the attackers in Paris, Brussels, London, Manchester, and now London Bridge. Rather than posturing on the difficulty of combating a lone wolf attacker, police response times, or extending security perimeters in the aftermath of an event, maybe we should focus on the circumstances surrounding what made the perpetrators "known" in the first place and what is done once the person becomes "known."  What does the term "known" mean, and what subsequent actions did or did not occur?  Are all...(Read Full Post)