The idea that lawlessness or criminal behavior is inhibited by a short wall in the subway between the platform and the tracks is absurd. There are broader cultural forces at play, in particular the "non-carcerial" alternatives that Singapore employs- harsh punishments for small crimes. Giuliani's "broken windows" policies on steroids.

If we wanted to emulate Singapore to make our subways safer, we would have to do much, much more than put up a little wall on the subway platform.