Two things.
First, the only way CCW would help in this situation is if somebody was "lucky enough" to be close enough to the shooter to realize what is going on and have the presense of mind to respond. Other then that one shot would be mighty hard to figure out wher it came from.
Second, why do we have to label violence against each other in differnet ways. Whether or not this is muslim terrorism, home grown terrorism, run of the mill wacko terrorism, or whatever, it is all terrorism.
Anytime something like this happens we should all be appalled, angry and willing to track down and punish the guilty in the most harsh mannor possible. Again to me whther or not our guy or guys or woman or whatever is a serial killer or a terroist makes no difference and shouldn't when it come time for them to pay.
Whether you shoot somebody robbing a liquor store, hit somebody over the head with a Louisville slugger or take an AK into a loaded mall you are the same, a simple animal in need of being put down. Your color doesn't matter, your belief system doesn't matter, your mental state doesn't matter, the only thing that matters is that you are a murderor and that simply cannot be tolerated.