I've heard a lot of people make comments similar to this. A lot... What I can't figure out is why. Is it the size, and weight, or do they have an unrealistic expectation of self defense when carrying? (mugged in broad daylight in the Walmart parking lot the only scenario)
I do know that a lot of people are absolutely obsessed with small guns, and keeping them from printing.
I'm not. A proper holster, proper belt, proper cover garment, and a populace that generally doesn't give a crap about anything not on their phones has me not caring one bit about if my full size gun may print a bit or not, but I can get a good grip on it, and it has decent magazine capacity, and can mount a light.
Also, do people who carry not ever go into places that are (or could be) dark? (Movie theater, parking garage, mall, walking with your wife through the park after dinner in the evening) Imagine you're in the mall, and the lights go out, then you here gunfire... There ain't no windows... few have skylights. If you're packing around a weapon, you're planning for things to go wrong. Things don't just go wrong in well lit places, or at well lit times of day. The people who do wrong things tend to plan them out that way much of the time...
I think that lights, (especially weapon mounted ones) are a technology that people are slow to accept, much like how police departments were slow to accept the semi-auto handgun, preferring instead to stick with the old wheel gun when they were getting outgunned on the street by crooks with high capacity autos... Like how departments didn't want rifles in patrol cars until after the North Hollywood shootout...
Keep in mind, the only time I've ever shot, or been shot at, has been during military deployments,but... I, you, we, typically carry for self defense... The chance of any of us ever getting into gunfight again here in the States is very, very small. However, if that ever does happen, the chance of it being in low light conditions, are very good. If you're gonna go to the trouble of packing around a gun, it makes good sense to equip it with a light.
I'm not asking you to agree, because I see you feel strongly, but for me, a weapon mounted light is not always needed because of my risk mitigating behavior.
I have two HD guns stashed in my home. In my gun room, where I spend a lot of time, I have my CZ Shadow 2. It doesn't have a light on it now, but likely will in the future. I worry less about this gun as I always have the lights on in there, and am not in there too terribly late. So in the event of a home invasion, I should be able to see. But like I said, I'll probably add one next time my preferred model (TLR7) is on sale.
My bedside gun, a VP9 with night sights and has a TLR7 on it, and I feel a light on any bedside gun is crucial.
However, I live in a small town that is for the most part quiet. Bad things do happen, but very infrequently. None the less, I do carry in my little town anywhere legal. However, I don't typically go out after dark, and if I do, it's to a friend's house, or to a local watering hole. I am not legally able to carry in bars, so when going out at night in my little berg, I tend to carry one of my Zero Tolerance knives. It's not ideal in any way, but it's better than nothing.
I do the majority of my shopping in the larger city an hour away from me. Lot's of bad things happen there, but as usual, they typically happen at night. Not always, and I almost always carry there. But I leave for the city early in the morning. Being there in daylight does make printing a little more of a concern to me as there are more people out, and you can just see easier, but I don't really sweat it as I'm not breaking the law. I am usually headed home long before dark. Occasionally there are delays and I'm there into early evening, but I am very deliberate about avoiding poorly lit locations in parking lots or other places I think an attack would be easily executed. And I choose to carry guns with night sights to help. I agree with you about being able to identify your target, but for my circumstances, that isn't going to be hard to do.
I see your point about dark locations, but again I go during the day when theaters are not even close to full, and lunatics typically choose times when they'll have a lot of targets, as in the evening.
So I'm not really saying I disagree with you in principal, but I am saying there are a lot of us rural people out there who do things a certain way that minimizes our risk. So I don't think this notion is quite as absolute as you portrayed it.
One thing is for sure. Having a light can sure be a clear benefit in a lot of ways, and LED lights are making it easier and easier all the time.