All the judo skills in the world aren't going to help you when a guy 100 meters away tears a plate-sized hole in your back with Mr. 5.56.
I think some people here underestimate what kind of preparation regular, twice a week, hour and a half long training for a year or two can provide. Many brawlers train martial arts as well, but if your enemy is not one of them, he will not have spent anything near that amount of time on deliberate practice.
On the other hand, martial arts are not much of an use if there's more than one enemy. Sure, you may be able to take out one of them, but the second one will not wait gladly for his turn.
My point? To paraphrase Han Solo: "Hokey religions and hand-to-hand are no match for a good blaster at your side ..."
Well, not quite. But that was too fun not to use.
The argument was that as someone trained in martial has significantly better chance than someone that isn't.
Depends on your definition of 'trained': attitude is everything.
A guy can be a trained martial artist, kick-ass in tournaments and still loose big in a fight because - away from the mat - he utterly lacks the will to fight.
My point - I guess this goes back to Mr. Solo - is that martial arts are great and all but it's way to easy to fool yourself that you're capable of kicking ass, but you're not.
Especially if you're facing off against a guy with a gun.
Which are pretty much available to anyone in the US, where I live.
Well of course, and a guy with a gun may still lose to a kid if he tries to operate it with his feet. In other words -- I don't accept your premise. If he has no will to fight, he will not fight. If he is forced to fight, he's at least no worse than someone who's not trained.
People trained in martial arts are more than capable of kicking ass, because, well, that's the whole point of martial arts. I suggest you to go to the martial arts training and see for yourself what kind of fight can trained people give.
And the whole gun talk only proves the fact that if you live in US, you're fucked and nothing can help you.