Earlier quoted context omitted.
I understand what you're saying, but really "there is nothi that can be done to stop it"? What about outlawing firearms for civilian use, or even just not letting the assault weapons ban lapse? And don't tell me every angry/depressed yuppie kid who was going to go on a rampage when guns were easier to get than a drivers license is going to negotiate some black market underworld he knows nothing about to get his guns.
The problem is that too many guns exist already in the USA. If guns had just been invented and only a few of them existed, or if we were a moon colony that had never imported guns, or if we were some country where, due to social/cultural/political circumstances very few people have guns, then gun control would stand a chance of working. But we have to work with what we've got. The situation we're actually in is this:…
a non-negligible percentage of the population carries concealed firearms wherever they go, then it's harder for mass tragedies to occur
The problem is that mass killings are a drop in the bucket. This guy killed 12 people (and maimed 50), and in a bad year you might have half a dozen of them. Say 60 dead to this kind of thing. But the US has 17000 homicides per year. Basing your legal response on spree killings is very much the wrong thing to do.
Given that most murders are crimes of passion done in the heat of the moment, you're going to cause more deaths by intentionally arming the population than saving lives by having a mass shooter killed after the first few victims.
Also, 'concealed carry' is not a magic bullet. Washington state went concealed carry in 1961, yet its crime rates rose and fell in step with its colleagues. Concealed carry arguments always relies on anecdotal arguments and never statistics, I find. The one stat that does get mentioned is crime rate, but there's rarely any mention of other factors (like rising incarceration rates)
Anyway, a simple counter to your armed robbery example - the robber almost always has the drop on you. Most people would rather give up the cash rather than risk the robber actually shooting you while you or a bystander start a mexican standoff.
the worst thing that will happen is you get three squares a day and a roof over your head at taxpayer expense
Really, we need to stop painting prison as a kind of holiday resort. No-one at risk of actually going to prison in any way actually thinks this.