Not to be argumentative, but we need to explore this a little more perhaps.
It is alluded that there are only a couple of situations where you ever pull your gun.
Either the bad guy has a gun and you have to shoot him or he does not have a gun and you have no right to shoot him.
This only addresses two out of of an enormous variety of situations where one might pull a gun.
Bad guys don't use guns only. They use all kind of weapons and do all kinds of bad things. Sometimes they pull a knife at 30 feet and you need to convince them that if they step closer they will be performated. A red dot on the chest and your pointing it out to them has been shown to make them think twice.
You don't always pull a gun to defend yourself, but to defend others. And, you don't always pull a gun to defend life, but innocence as well. You can use deadly force to stop sexual assault, for instance (as well as Arson and other things).
Say for example you come upon a mutant trying to rape a woman. He is in the initial stages of attack. He is on top of her. Do you shoot him stone dead and risk hitting her as well? Even if you killed him without hitting her, do you think a jury would look kindly on your shooting someone in the back with no attempt to talk them down? No, you draw down on him, light him up with the laser and say "cease and desist muther ****er or die". (Or something like that
). If he stills acts aggresively, point out the dot on his chest.
Another scenario: three mutants surround you and plan to beat you down. They pose "disparity of force" but no weapons. You could technically shoot them, but it would be most undesirable to shoot them and face the jury. You will if you must. Pull your gun, light up a couple of them on their chests and make the laser obvious that it is pointing at their friends' chests as well as their own. Shoot if you must but try like hell not to because you do not want to face a jury on this one.
I could go on and on. There are myriad scenarios where you pull your gun and they are not cut and dry. The laser gives you another tool in the tool box. If it is of no use, ten no problem, but if it comes in handy it could save your butt.
There is a true story of a man who stopped a BG from digging a shotgun out of his car trunk by putting a laser dot on his chest. Argue if you like, but time and again, putting a red dot on someone has been proven to make them think twice. Maybe Hollywierd has engrained it into people or whatnot, but people get real scared when the laser hits them.
You can also fire from cover positions or point shooting with a laser, without lining up the regular sights if you HAVE to. Once again, this is not a normal thing, but let's use our imagination here. Bad days do not always include the "bad guy" standing in front of you and the two of you drawing down to see who the fastest is. Street scenarios are as endless as our imagination because really wierd stuff happens when TSHTF.
I am not preaching, nor arguing, but I am just saying that the laser is a tool in your toolbox and it can come in handy if you think about it and use it with some wit.
As far as I can tell, I cannot see a reason NOT to have a laser, because mine is a Lasermax that fits inside the gun, replacing the guide rod. There is no added bulk, it is just there if I want it. The only downside is the cost of it, and I can totally understand why someone would not want to spend the cash on something they will probably never use.
I have been in some hairy and wierd situations, and yet I have never used a laser. BUT, I know some hardcore cops who draw down on people as a daily routine (some really BAD people) and they swear up and down that a laser is one hell of an intimidation device that has kept them from having to shoot a lot of people. If agencies could afford to, most would issue them to every cop.