It is certainly most idealistic to believe that gun control -gun control by which I'm referring to the acquisition of fire-arms legally- is totally possible- rather it isn't even that much probable.
Disagreeing with the idea of guns not being sold to anyone, I just have one thing to say for this point, look, legal acquisition lets the government monitor firearm's, where they are, how many were bought, and it also brings responsibility to the owner and if they didn't, and you say, just stop giving them guns, you know what would happen?
Just take a look at anyone that has to protect himself.. they turn into mad-men, they think they're above the law, but that is all speculation, but what is not is the fact that with zero legal selling of guns, people WILL turn towards illegal means of acquiring some, which will be then disabling the gov. to monitor them.. you may argue that what is the need to do so, you already said the gov. isn't doing anything and I'll answer it with a simple "The next government will" or at-least they will have to.....
Let's just take a moment here and think about this... it's not the law that's enabling terrorists to openly kill anyone in that country, rather it's the weak administration and regulation of set laws and rules... it's not the act of having access to firearms in the open market, rather it's about the government- who as I see it is responsible for it since they're acting (or trying to) upon the law- who are not implementing those policies... because what good are laws if not acted upon?
I am not exactly sure as to how, when, or even if you do this in your country, but are there are laws- that are enacted upon that is- that check-up with firearm owners too see if they're mental stability is still there? If so, good, if not... well then there is a sure need.
That is not to say that the individual is to blame here.. the individual either mentally unstable or being rational- at-least in his mind- while doing so (and by rational I refer to him willingly doing so without any sign of coercion or signs of sanity leaving) is right now as I see it unknown.. but it is a fool's action to ignore the individual and blame the gun- or do it the opposite way- as doing such would negate any forms of progress.
But to blame the religion once again is foolish. The religion itself has many perspectives, and many oppose senseless killing and violence...
The way I see it, everything is inter-related..
Faulty government/weak administration ---------------> Guns being given to the mentally unstable/no check ups to see if owners are sane --------------> this man being in possession of assault rifles and such (which by the way I'm in disagreement with, there is no probable need to give assault rifles to citizens)----------------> and let's not forget the man being influenced by different perspectives------------> to this accident happening.