It is sort of interesting to compare similar concepts and problems. A lot of people think laser sights, are so bad, like tracers and flashlights, because they give away one's position, but some think that racking a shotgun in the middle of the night so that you notify your home intruder that you are present, general location determined by the sound made, and that you are armed is a good idea.
I think they all have their place, but I would count on none to convince the bad guys to leave. Of course, tracers may help to convince the bad guys to leave, but at that point, you have opened fire.
"If you look through your scope and see your shoe, aim higher."
-- said to me by my 11 year old daughter before going out for hogs 8/13/2011