The shooters in the Middle East and other places where undisciplined men fire guns into the sky as an act of anything from celebration to desperation have never struck me as people likely to be concerned with physics or anything else involving even a modicum of intelligent enquiry.
But it turns out that, contrary to my intuition, it might well be that bullets fired straight up don’t do much damage on the way down, unlike bullets fired at an angle and coming to earth as their velocity is ovewhelmed by gravity.
Here’s a fair summary of a Mythbusters episode I saw not too long ago on this.
http://kwc.org/mythbusters/2006/04/episode_50_bullets_fired_up_vo.html