ASAT: http://en.wikipedia.org/wiki/Anti-satellite_weapon
Of course, but when something completly unnecessary becomes a threat for thousands of people, because tons of idiots abuse it, it should be made illegal. Sure, everyone has stuff you don't "need" but you cannot "shoot down" airplanes and helicopters with most of it.
Seriously, who needs a green laser which is powerful enough to light-up an airplane cockpit? I would say only people who want to light-up an airplane cockpit.
EDIT: Only talking about pointers by the way, show laser systems for concerts etc. are something different.
You can't have my laser quick sighting system off my rifle or pistol either.