Well, most people (usually liberals but sometimes conservatives, in this case just guessing that someone owning an art gallery is a liberal) need something bad to happen to them -- to wake them up MAYBE -- because they just won't listen to advice re: not being a victim-waiting-to-happen. Instead, they play the odds that with so many people out there just like them (prey animals) criminals (predators) probably won't pick THEM but someone else. Or they think guns are evil and they can reason with criminals. Or rely on a criminal's "mercy" not to do worse to them. These people were lucky the wife wasn't raped/strangled and the guy shot (or worse).
Did they learn anything? Will at least ONE of them carry NOW? Did they vote for anti-gun politicians pushing anti-gun legislation in the past? Will they continue that policy NOW? The article doesn't say (didn't ask them?) what the victims will do from now on, but it may be they will just HOPE it doesn't happen to them again. And maybe even vote for MORE repressive anti-gun legislation, as if "being tougher on guns" would disarm the criminals who robbed their gallery. And since they felt "lucky" it wasn't worse, apparently they depend on luck a lot more than themselves -- another standard liberal trait.
As for a gun, being within arm's reach (at the very least) is a good rule a home, but on your person is better since it's more convenient when you move around your house/apartment (unless you have something in every room, as some do). Of course, going past your front door it definitely needs to be ON you, not in your car, purse (women's or a "man's" European Shoulder Bag or metrosexual carry-all) or left at home.
Simple common-sense rules, really, but few seem to get it.
P.S. I know when I stop for gas anythere on Central Ave (in ABQ -- in Las Cruces I get gas at the Shell across from the Village Inn on Lohman @ Telshore -- a lot safer), I need to be MORE aware due to the number of transients/bums there, some of whom come up to you asking for change. And that's in broad daylight, mind you: After dark it gets a whole lot worse and the "quality" of the bums goes WAY down then, with a few certified card-carrying psychos added to the mix. But, it's good practice.
Yes, try to be armed at ALL times. It's not paranoid, it's just prudent.