Not all crime can be prevented. Especially crimes such as this, which are not motivated by commonly shared passions.

It might lend force to a call to renew stop & frisk, because despite the paucity of recovered firearms (<0.1%) or 715 firearms/532,000 stops, proponents claim its principal advantage lies in criminals knowing that they might be searched & thus less likely to carry in the first place.

Ironically, it's the mirror image of the NRA's argument that knowing honest citizens might be armed dissuades a significant amount of crime.

Who knows?

I think most importantly that stop & frisk violates the 14th amendment's equal protection requirement.

But that's just me. Another might argue that stop & frisk is a vital component of equal protection because by reducing violent crime it makes lower income communities safer.

Few are willing acknowledge that neither the Constitution or the Bill of Rights were designed to expedite law enforcement, & that living in a relatively free society entails accepting a degree of crime, especially random outbursts such as this, which generally defy anticipation.