Having once been robbed in Thompkin's Square at knifepoint (mentioned on another thread, won't bore here)what you say is certainly true. Very, very true.
I might add that when you are about to be robbed, the perp(s) will be heading in a direction as to cut-off your options by quickly intercepting you as you walk. Ever had the feeling "Whoa! where'd you come from?", well, these folks picked you out long before they decided to move in. And this is a very natural reaction.
In my earlier post on this thread I proposed a solution that would make many of the 'advice' suggestions irrelevant. When a group of people descend to such a level that rape, robbery, and murder become commonplace decisions, such that planning takes place, then they need to be eliminated without predjudice.
Hundreds of well armed citizens could form teams using decoys to draw this predatory element out of the shadows of every major metropolitan city during the early morning hours and kill them.
The death toll would, of course, be staggering. Our cops would be pissed. Every city hall would be calling for the heads of these vigilantes. Yet, the one thing that would go without notice is, everyone in every city would be safer. Much safer. Think 'leave your front door unlocked' safer.
Perhaps it's time to perceive this element as domestic enemies and consider how little our police agencies have succeeded in eliminating this threat to the people at-large. Perhaps it's time cops think outside of the doughnut box. An even better idea would be for them to just get out of the way and go back to what they're really good at, writing parking tickets.
I'm not so sure just how pissed the cops (NYPD) would be -- other than the increased paperwork, that is.