Goddamnit, it's a grey area, it's complicated.
No, it isn't actually. A guy who stabs someone with a knife can go buy a knife the moment he's released from prison. Why isn't that "complicated". What "complicates" the gun thing is the mass of terrified white guys with tiny cocks and dwindling economic prospects trying to find some sort of way to feel powerful, and us deciding we should enable that with weapons capable of mass murder instead of sh*tty cars or some other coded status symbol.