I would rather be armed.
If I could save myself or someone else, it would be worth the risk.
How about Virginia Tech, where Cho chained the doors shut.
Yes, being armed has it's own drawbacks, but the deterrent value of multiple armed defenders has to be taken into account as well.
At least folks have a chance of barricading themselves in an office and holding off an armed attacker.
I don't disagree that sometimes I would want to be armed and sometimes not. Since I choose not to concealed carry obviously I've decided there are mores time I wouldn't than would. I couldn't live with myself if I shot and killed the wrong person. A lot of responsibility.
There was someone carrying at the Tucson shooting. If he was going to shoot someone it would have been the wrong person. Luckily he was responsible and shot no one. But that didn't help stop the shooter. The shooter was stopped when he tried to reload. Which as you know is why I think magazine size should be limited. If the concealed carry guy had picked the right person and shot I really think he'd have got him in 3 or less shots. And if it took more there would have been others accidently shot.
I'll prelude this comment with this caveat...the chances are infinitesimal that either of us would ever need a gun to defend ourselves.
These mass shootings are big news, but the fact is, Homicide is down 49% since 1991, and I think there is little doubt that gun rights have expanded greatly in that time.
Conceal Carry was but a glimmer on the horizon in 1991 when homicides reached their peak.
And mass murder is an extremely small percentage of homicide.
10News - Mass, multiple murders rates constant despite overall decline in homicides12172012 - 10News.com - News
I reckon I would respond to your post thusly...
If I have a gun, I have the choice of using it, or not using it, dependent on the situation.
If I choose to carry no gun, all further choices evaporate.
I'd rather leave my options open than close them off and leave myself and others helpless if the situation unfolded in a way in which my firearm could save lives.
More succinctly, I rather have it and not need it, or have it and not use it than need it and not have it.