Yes, it is one of the reasons that people like my "pro-rape" mother wants restrictions placed on the access of shooters to guns. Lots of people are quite responsible with guns, some are not, some are out to kill. Isn't it kind of sensible to get guns out of the hands of the dangerous ones whenever it is possible, rather than getting rid of all gun control like Libertarians (like youself, if I am not mistaken) appear to be advocating?
There is no way to keep semi-humans from getting guns: I could make a sidearm or longarm myself with equipment ordered from Sears.
Since the bad guys can get them, the best course is to make them easily available to honest citizens, so they can fight back. To deter the bad guys, programs like the NRA-supported "Project Exile" have been seen to work fairly well: any crime committed when a gun is used (defined as being visible) brings an extra five, ten, or twenty years, depending on the crime -- with no possibility of parole, and in some versions no good time, so five years means five full years, ten means ten, and twenty means twenty.
You're right. It's a crying shame that while people are quite appropriately tested and licensed to drive a car, any idiot with a grudge can get-hold of a "legal" firearm.
Driving a car is not a right; owning your chosen means of self-defense is. To deny someone the exercise of that right is to tell him/her that in your eyes his/her life isn't worth a thing.
And it's quite appropriate that anyone who's been threatened, who has a violent ex-boyfriend, who works in an area with high crime, to be able to get a firearm the moment the danger is realized.
According to people who've been faced with a mortal threat, their possession and producing a firearm save one or more lives some quarter million lives per year -- sufficient argument from a pragmatic viewpoint to support having firearms available to all.
Of course, there's the Clinton approach, which was to tell criminals they couldn't buy guns -- but to make no provision whatsoever for arresting the ones who tried! Perhaps deputizing every gun store owner and some employees to make arrests for that purpose only would have actually put the roughly one hundred thousand felons Clinton claimed were prevented from buying guns while he was president behind bars.
The trouble with gun control is that there's not a single law in existence that has kept any crime with a gun from happening -- except the ones that punish criminals fr using a firearm. Cutting them off at the source, by arresting them the moment they try to buy one, makes far more sense than all the current gun control laws put together.