There are a hundred different ways that any one specific scenario can play out and trying to judge or interpret any one is asinine.
I feel that as long as I have the ability to help others then I am obligated to do so. It's no different than a paramedic stopping to help a dying or injured person while they are off duty.
There are always "experts" that will analyze each situation but unless they have been there themselves then it is all just talk.
As you and bofa have preached, it is always good to be prepared, right? I like that. Not only should you prepare physically (gun range, drawing speed, etc.), you need to prepare MENTALLY. And while some of this discussion may seem "asinine" to you, you should note that we should ALL think about the many possible encounters so that our mind is more prepared when sh!t hits the fan. Look, you can train all you want at a gun range, but when face with a crisis, all that training is useless if you have no clue mentally how to react. A hesitation here or there...tunnel vision without a clue of surrounding...lack of awareness of situation and too much testosterone/heroism...and so on can be extremely disastrous. Let's not give CHL owners a bad name by doing something real stupid. I think/hope that we all can agree on that.
As for your paramedic analogy, it is a horrible one. An off-duty paramedic (or even myself as a physician) will stop to help someone because we can make a positive difference more often than a CCW/CHL owner in a dark crowded theater against a heavily armed shooter...and the risk of life (or limb) is very low for the paramedic and surrounding civilians. The risk to myself (e.g. lawsuit) is very minimal as long as I do things in good faith...even if the patient dies. I am protected by law. (Of course, i am not talking about potential risk such as being hit by oncoming traffic in my attempt to help the patient or car explode due to leaking gasoline.) Risk of bad things happening (dying, killing innocents, lawsuits, etc.) in the scenario above (CO theater shooting) is extremely high, do you not agree? And if you injure (much less kill) someone else, you're NOT protected by any law. Comparing it to a paramedic risk is not valid.
Your last sentence quoted above is correct. We are all "mall ninjas." Until faced with the situation, all of this talk is just speculation on what we might do. Hey, i might turn into a hero, instead of acting like a chickensh!t.

I try to play these scenarios in my head so that i know the alternatives...and listening to you and bofa has been a learning experience...because i would never think of approaching the shooter. But, at the same time, you guys also need to consider what I am saying.
The CO theater shooting is NOT as simple as you guys think. Approach shooter. Kill. Easy. NO, it is not that easy. AR15 ammo rips thru seats. You have no cover...none whatsoever. The guy used tear gas. The guy is moving. Muzzle fire from your gun in an attempt to shoot him will give your location away. (Can you hit his head while he's moving with one shot under high stress environment? You better! He is not a possum on a fence.) He just points his AR15 at muzzle fire location and rips thru his clip...and you're dead. He has more body armor than you...whatever he has on him is more than your t-shirt. He has more powerful ammo than you. He is shooting from the front of the theater where his lower body is protected by people crawling and dying in front of him. It is dark...noisy...panicking people scrambling around. Tear gas! This guy is very smart...he planned it extremely well. He had all the advantage. Apparently, there were military folks in that theater that night. Of course, none were armed...but also, none made any attempt (that we know of) to physically attack the guy. Maybe, the windows of opportunity to do so is so tiny (if at all) that none of the military folks thought that it was possible. I don't know. But, i also don't jump to conclusion quickly about taking action without knowing my surrounding and circumstance.
That is my point. You guys may not have considered all of these before typing your actions out in this thread. Do we need to discuss this? We should because it helps us prepare mentally and gives us different perspective about a certain situation.
So, no, i do not think that it is asinine to discuss/judge options. IMHO.