I have a 15mW Astro Pointer (pulsed green) - and I can tell you it can paint a beam on a mountain over a couple of km away. Only used in rural areas showing kids constellations and as such it's a great educational tool instead of wiggling your arm vaguely at the sky and saying see that star up there - it's the next one over. Never use in an urban environment but a lot of kids fun to be had attaching one of the many crazy beam scatter heads available that split the beam into a hundred or so patterns for disco lights while camping.
As an educational tool it's great - and at the same time you educate the kids to use it responsibly - in the same way we were taught to use potentially dangerous things like axes at Scouts. Personally I'd rather be dodging a kid with a laser pen than a kid with an axe but nutters will be nutters.
Don't blame the technology blame the education (in general) of irresponsible morons