Good discussion.
There seems to be at least two question being debated here.
1) Is it necessary to use the sights for every shot to get good hits?
2) Should we shoot at all without using the sights?
As for myself, I'm no LEO or combat veteran; I'm just an average Joe, so to speak. And wherever possible, I try to use the sights on my gun. I won't try to get into the technicalities of "flash pictures" and so forth because I'm a rank amateur compared to many of you and it would sound ridiculous. I will say that I do at least try to find the front sight for most of my shooting. Anything longer than about 10 yards, and I pretty much have to get a decent sight picture to keep my hits inside the A-box.
However, I recently watched a few videos at my close quarters defensive handgun classes where the potential victims were ambushed at close range and had no choice but to draw and shoot one-handed, and in at least three cases, had to fire from a non-standard position, two of them were basically hip-shots. One of those was from the man's back on the ground.
We also were given an observation from a well-known gunfighter (sorry I can't remember his name right now, Ayoob, Hackathorn, someone). I'm paraphrasing here: 'there are three things you will never feel you have enough of in a gunfight: time, space, and bullets.'
The lesson was there are times when you just don't have the time to bring the gun up and shoot from a Weaver/modified Weaver/Isosceles/etc. stance. Sometimes the attack happens so quickly that you barely have time to draw and get the gun pointed in the right direction. Sometimes you don't even have that much time.
Did those point-shots in the videos stop the fight right then and there? Nope. Follow-up shots were necessary in each case. But they did get hits, and those hits and the attackers' subsequent reflexive reactions (flinching/pulling away) gave the defenders a split second to back away/fall away and get a better grip on the gun for their follow-up shots. In one of the incidents that one shot to the side was enough to effectively end the fight, as the attacker turned and ran out of the store.
Should they have waited until they could've gotten themselves into a more stable, two-handed technically perfect stance to fire a shot? Based on what we saw in the videos, the answer to that was a clear "no."
And the more I learn at those classes, the more of these types of video clips I watch, the more I realize that being able to stand there in a mechanically perfect stance and deliver rounds as if I were at the range punching paper is a fantastic luxury that many (not most, but many) times I will not have, should I become the subject of such an encounter.
In fact, it's seems fairly likely that I'll have to fire my gun one-handed, probably while trying to find cover or even just ducking, and from a body position that is not perfectly stable. And that might include having to point-shoot for my life.
So with that reality in mind, I think it's necessary to my overall training regimen to practice shooting one-handed (both right and left), from non-standard positions, such as kneeling, from the ground, peeking around cover, etc. And so that includes point-shooting, whether it's from the "hip," (I actually shoot more from the side of my ribs than the hip), or from the center of my chest, or whatever.
Now someone stated earlier something to the effect of, 'you need better than a few A-box shots to stop an attacker.' And I would agree with that, but doesn't it also stand to reason that some hits are better than no hits (going with the hockey mantra, "you have to get shots on goal to score")?
Also, isn't there a chance that some of those 'A-box' hits will in fact hit something vital?
And don't the odds of getting a CNS/vital hit while point-shooting increase if you practice such shots? I mean, I'm not saying we can become the next Bob Munden, but take this video clip for example:
https://youtu.be/MXds-RgjOe4
(I made several mistakes during this drill, for bonus points maybe someone can figure out what they were)
The first three shots are all point shots, two from the side of the ribs, and the third is a chest indexed shot. Two of those rounds landed within 1.5 inches of each other, the other was about 6 inches below the other two. All shots were inside the 'A-box.' Two of those shots would've most likely impacted the spine had the bullets penetrated as advertised.
Yes, there was probably some luck in the POI of those shots, but I practice this type of shooting at least once a month, so my groups rarely print outside the A-box area.
Starting to digress. I was just trying to make the observation that sometimes one doesn't have the time or space to get into a technically perfect stance/position to take a shot in a defensive situation. Sometimes you have to work with whatever God/Fate gives you.
Anyway, I've enjoyed reading this thread and the varying opinions expressed here.