A comment for consideration. The vast majority of the public is unarmed, thus the data will be skewed that direction. However, as legal CHL holders, we must realize that any confrontation we are involved in will be an armed confrontation. (Yes, there are exceptions, like .gov or .edu situations) I'll reference this in a minute.
I would break it into a couple basic categories.
"Practical" Skills, that could also be needed for Violent Attack
Defensive driving
First Aid
Needing either of these are far more likely, and far more broadly useful than the following skills. There is a much higher chance of needing to drive on ice, or regain control of a vehicle, or administer first aid than dealing with a mugging/burglary.
Preventing Physical Violence
Here is where we all agree, Mindset/Awareness is the most important thing we can do, followed closely by Managing Unknown (or known) Contacts.
So far, the numbers from Troy show that who we spend time with, and when we are out and about have the biggest influence on likelihood of attack.
Not being "contacted" in the first place, or being able de-escalate or flee the "contact" is paramount.
Dealing With Physical Violence
In no order particular H2H unarmed, H2H armed (knife, club etc), Gun
Here I'll reference my comment earlier. As a civilian, I cannot "radio for backup." So I am on my own until I win or lose the fight; I don't have the luxury of "staying in the fight till backup arrives." Next comment is as an armed person, if I get to a physical confrontation, it's lethal. Because if it gets to H2H, the BG could get my gun. So as a civilian with a gun, my duty is 1 of 2 options, de-escalate, back down (pride fights), or flee; UNLESS it justifies lethal force. The way I see it, if I get in a fight, justified or not, I've introduced lethal force to the fight. Sure, there's exceptions. An 8 year old or 90lb woman (I'm 6'1" 185lbs) come to mind, but in that case, it still doesn't mean I'm free to get into a fight, it just means it takes more to justify lethal force. As Troy mentioned, non LEO can usually justify lethal force quicker, however IMO, that also means armed non-LEO have more of a duty to avoid the confrontation in the first place. (Side note, being able to voice this would, again IMO, help you in court should the SHTF.) Finally, the goal here is "survival." Both for yourself and loved ones. To my knowledge, being able to master the handgun for self defense will ultimately take less time than it would become proficient enough in H2H of any sort enough for my life to depend upon it.
All that to say, I can't see as a civilian, H2H being anything other than a means of staying alive until I can get to a better weapon (read gun for the most part), with which to disable the opponent. Not discounting the importance of H2H skills, but if I'm in a fight, it's not to "subdue" or "beat up" the other guy, it's to survive.
The line is fine, but simple to me. If I get into a fight, the "fear of great bodily harm or death" clause has been met, and I will use whatever means I deem best at the time to end the fight.
Again, all that to say that to me, any firearm training that does not include fighting to or defending your gun, is not complete. (Not to imply not beneficial, just not complete) Likewise, any H2H training that does not focus on ending the fight ASAP, or creating enough distance to access a better weapon, is not complete. I understand reality enough to know that a BG will not step out at 10 paces and announce that on the count of 3 he is going to shoot; but I also realize that I do not have the time, or interest to devote to learning the necessary H2H skills to be able to take on all comers when my life counts on it.
End Ramble.
