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Have you shown this person videos of sovereign citizens trying this against cops on the side of the road, or in court?

Having taken part in an effort to talk some sense into someone who was bound and determined on a self-destructive course with his life, I think the chance of success is small but nonzero. And, his brain might hearken back to it at whatever future point he inevitably starts experiencing physical in person consequences, and it might help him get out of the cycle at that point, even if nothing good happens before then.