I don't think unlocking a case makes it a lot more difficult to get your gun.
I would say that manipulating a lock, or remembering a numeric code, is precisely the sort of fine-dexterity task that you really can't do in the middle of a dissociative rage. That's the point of a locked case, after all - to make it hard for people to get your gun.
Not to the degree that pulling a trigger is easier than stabbing someone.
Right, you made the argument earlier that stabbing someone is somehow more visceral (pardon the pun) and direct than a firearm, and that that's an obstacle to some amount of murders.
But is it? I feel like if the law against murder - if the
moral norm against murder - isn't enough, than the mental block against plunging blades into another person's body probably isn't going to be an obstacle.
And most people know their killer, too.
Exactly. Homicide is the crime with the lowest recidivism because murders are usually for a perceived reason. Random mass murder, by any means, is just absurdly rare.