Hahahahahahhahahahahaaa!!
Another strawman argument. You put up an argument I didn't make, then argue against it. Nobody is saying he never new he had a responsibility to others or to handle a gun safely. I am arguing its entirely possible it doesn't occur to a person who is awakened from deep sleep, perhaps foggy from late evening drinking, his mind enveloped in fear, that the noise he heard was not a burglar, and that the person who startles him in the hall is not a burglar. You're essentially arguing that such a person should be as clear thinking in the crunch as he is in a classroom setting. Bwahahahahahahaa!
Your deterence argument falls flat because it depends on there being an offense in the first place. "Oh, I'll just declare an offense, and every argument that depends on it will look solid and convincing to anybody who doesn't notice" Hahahahahahaaa. (I'm being generous by assuming you were even thinking through on your argument.)
Furthermore, you equate a rare tragedy being repeated with people who repeat their behaviors much, much more frequently. And, you even include non-crimes like alcoholism and gambling. Bwahahahahahahahahahaa!!
Well, its been fun. Entertaining even. But, since you cannot really do more than twist my arguments and go off on tangents, I suppose I'll get little rational argument from you. (sigh)