Since we seem to "agree to disagree" in terms of "simply not having room" our respective philosophies...
What is your magical threshold for self-harm where you feel you have the right to stop or prevent it? Smoking, alcohol, a more "normal" tattoo, something more, parachuting, swimming with sharks?
Because if you do believe you have the right, and I disagree, and you try to impose your will on me, I'll just have to shoot you.
It's really that simple.
But perhaps, like the anti-gunners in the 10+ round magazine analogy I posted above, perhaps you intend to outsource the responsibility to someone else, rather than take that risk personally? If so, you're a coward.
If you think greater power is magically invested in the state or just some larger body of people, than you yourself have alone, then you are a fool.
(Oh and if someone, especially a mod thinks I've crossed a line because of "Polite", I'll point out "Armed" and all that implies is in the name first.)
Not to worry, were you on fire I would not stop to piss on you. Let Darwin do the dirty work and chlorinate the gene pool is the best answer in many cases.
The threshold for intervention on my part is is very much dependent on my relation to the person is question. Lowest for those nearest to me by blood or relation, getting gradually higher the more distant the relationship by blood or fellowship.
* Immediate family (wife & kids)
* Father, mother, siblings
* Nieces, nephews
* Aunts, uncles
* Cousins
* Friends
* Neighbors, fellow parishioners
* Strangers of same biological background
* Strangers of even more distant biological background
Another axis to consider is that of the severity of self-harm. Still another is risk to my self or my family. There are probably more factors.
Of course, I would enlist the aid of my local community in many cases. I can not be everywhere at all times, after all. I pay plenty in taxes for local police & sheriffs, the county hospital, and the county mental hospital. I know folk that do this work, as they are my neighbors and/or colleagues of my wife.
So, in your case AJ:
You being a stranger, belligerent, and having already threatened violence; I would likely let you sleep in the bed you made for yourself or burn without intervention. Now, if your self-immolation were likely to be a fire hazard to others' persons or property, I would be certain to call the local emergency services. The only way I can conceive of acting my own self would be if your self-harm were to place me & mine at risk. In that case, I would do whatever I felt necessary to eliminate that risk.
NOTE 1:
a. I have physically restrained a neighbor who was suffering the effects of TBI and a psych medication foul-up.
b. I have also restrained a physically able man who had suffered from the effects of hypoxia on the brain from a previous illness.
c. When in HS, college, and the service, I did various things to keep intoxicated buddies from self-harm, several times against their will (at the time). Lost one buddy.
NOTE 2:
My wife has intervened as part of her work more times than I can recount. She's good with the crazy patients, so most time can talk them down. Other times, she called on the resources available to her.