I currently live in an area that is relatively safe. I don't even shut my doors at night, let alone lock them, and I don't have any firearms on the property. Then again, I used to live in low-income housing on the bad side of Baltimore in a neighborhood where the local police station was firebombed and I felt pretty safe there too, also without firearms on hand...that comes with minding one's own business, not letting anyone think you have anything worth taking, and knowing the difference between rational fear and hysteria.
I'm simply not comfortable imposing my ideas of what people should or should not have on others. I have extreme difficulty in seeing the appeal of smartphones, alcoholic beverages, anything carbonated, fake sugar, non-fat creamer, cosmetic anything, more than two pairs of shoes, any business suit, a car that costs more than four figures, or the existence of polyester t-shirts...but I'm not going to tell anyone they shouldn't be able to own these things, even when they are orders of magnitude more likely to kill me than firearms.
I'm personally much more concerned about threats to my privacy, freedom of expression, freedom of movement, and ability to acquire or transfer property than I am about the minuscule chance that I might be on the receiving end of a bullet.
I don't personally believe that I am universally safer from physical harm because of the presence of firearms, but people thinking they can tell me what I can or cannot do is a clear and present danger. Guns, not so much.
What do you expect people to do? Interrupt their lives to mourn every stranger that passes? The danger has past, the survivors are being treated. Life, and business, must go on.
In a place with the population of the Vega metro area,
I'm not sure what makes the lives of people killed in a mass murder, or the families of the survivors, any more or less worthy of consideration than any other victim of tragedy...cause that's what every death is, to someone.
The victims will have the same public services available to them as anyone, though there will certainly be private charities and funds.
And what society doesn't have the potential for such an event?
I agree, 68 or so died in Norway, a country with very restrictive gun laws, you just can't stop a dedicated maniac.