The legality of guns in bars and nightclubs is another gun control logic. Yes, I know some states prohibit it... but they absolutely should not. Its just another "gun free" zone and look at the results.
Yes, look at the results, criminals break the law and shoot people at their whim.
If there is one place where I think it is actually a good idea to prohibit being armed, it is a place where people deliberately go to be intoxicated. UNLIKE places were the majority of people are expected to be sane, sober, of reasonably good judgment, such as a school, public building, hospital, courthouse, etc., bars and nightclubs ARE different.
I'm against the idea of gun free zones, generally, but in a bar someplace where people choose to go to have their judgment impaired, I'm ok with a no guns (or any other weapon) policy. While it does put patrons at an increased risk IF a shooting happens, I think not allowing guns where people get drunk DECREASES the risk of a shooting actually happening.
As far as "would a CCW have made a difference?" The answer is obviously "yes". ANY change to the situation would be a difference.
Now, "would a CCW have stopped the attack?" (made a significant difference?) THAT IS A DIFFERENT QUESTION.
The ONLY thing we can accept as valid is the fact that a CCW not being there (because of law) renders the "could they have been stopped" question irrelevant.