Well dayumn, since I missed the other thread...why the hell not...
Very limited uses:
a) When you don't know how to use the sights (because if you do sights are much faster).
b) When you can't use the sights (disadvantaged position, or wearing gear that prevents their use like NVGs or MOPP gear.
c) As a (questionable) force option (bad guy sees laser and wets his pants).
Your average, run of the mill gun owner might actually benefit under (a) above since he fires zero rounds per year, assuming the dust bunnies in his weapon don't cause a malfunction or he hasn't shot himself with hit yet.
Your average, run of the mill Arfcom reader probably won't benefit at all since he probably won't be shooting with NVG or MOPP gear. Of course there are a few...
(not me!)
For defensive, civilian use (c) just seems like a bad idea because so few civilians train for escalation of force scenarios. E.g. how many of us ALWAYS carry OC in addition to a pistol? If you've got to draw your weapon you back is probably already up against the proverbial wall, anyway!
aa