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I’m not persuaded by the overall argument (seems on the right track, but still trying to nail down the core point).

However, this bit is brilliant:

“redistribution of personal responsibility”

That may very well nail the point right there.
There are bad guys. Really bad guys. They have too much bad.
So...
Redistribute it. Spread the bad around (seems an acceptable outcome for the Left’s economics, may as well do it with morality).
You (dear reader) are a good guy, with a gun. Good enough you could be trusted with an M16 in an orphanage. You don’t have enough bad in you (relative to “bad guy with a gun”), so you get some mass-murderer’s abundance of evil spread to you for the purpose of flattening out that distribution of evil to some uniform low point (as though it can’t be eliminated, just lowered to average).
Now ... you’re a bad guy, with a gun.

And since, by redistributing personal responsibility, you’re a bad guy with a gun, you must be disarmed of that gun.
Oh, but the “everyone is a little bad” Leftist with a gun? well, he has a gun for the right Leftist-approved reasons, so his redistributed bad is overlooked, so he’s not _really_ a “bad guy with a gun” under the circumstances (just like Michael Moore is a rich white guy with armed guards, but since he’s serving the Revolution it’s OK).

So there we go.
Money is evil, and having lots of money is evil, but since a Leftist axiom is “wealth is constant” then all money must be redistributed among everyone (except those who serve the Revolution exceptionally well, they can be rich).
Evil is ... well ... evil, and being really evil is evil, but since a (newly discovered) Leftist axiom is “evil is constant” then all evil must be redistributed among everyone (except in service to the Revolution, then evil isn’t an issue).
And since everyone now is assigned the same level of evil, anyone with a gun is, well, a bad guy with a gun and thus must be disarmed (except in service to the Revolution).

Clarifies it to me. Given the axiomatic imperative “everyone is equal”, then ... everyone is equally evil, which means if you’re a man with a gun then you’re a bad man with a gun and thus must be disarmed (service to the Revolution excepted). Hence Leftists cannot conceive of the notion that “good man with a gun” exists.