Errrr...no, actually, in my opinion not having it concealed to a point where it'll remain concealed during a fistfight is foolish.
In my opinion, anyways. And a good case can be made for ALWAYS carrying OC spray when packin' a gun, for this same basic issue: a less-than-lethal situation breaking out.
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The basic question to ask yourself is: "am I in fear of losing my life and/or suffering great bodily injury?"
Any number of things will alter the answer to that question: the number of assailants, the motive (hate crime? outright assassination attempt?), who the assailant is, what ELSE have they done (did you just see them stomp the stuffing outta some other dude?), and much more. Your own medical history factors in: is there some reason a punch to the face will do you serious harm, or even increase your risk (former stroke patient, fr'instance)?
Example: my kid brother at age 15 had multiple brain surgeries for hydrocephalus, and had different attempts done to put plastic shunt hardware in. So by a few months into this, he had unstable plastic hardware in his head, and about six holes though his skull
.
At a local grocery store, some big black dude assumed he was a skinhead, as his hair was clearly shaved and he had a black knit cap over his head. So this moron tries to pick a fight with him. My brother took his cap off...the sight of about 40 stitches and other obvious medical work took the wind right out of the idiot, and he apologized profusely.
But let's say he came out swinging faster...and I was nearby with a CCW piece. I guarantee you, at the first hint this guy was going to punch my brother (first time or repeatedly), I'd have drawn and fired in one smooth motion, no regrets, no hesitation whatsoever. No warning, either. I would act to reduce the risk of death to my kin from the illegal assault to the maximum degree physically possible.
It wouldn't have MATTERED what the assailant thought he was doing. What would matter was the risk of severe medical harm the idiot was going to do to my kid brother.
(Oh ya: after 11 surgeries in a period of a bit over a year, four months in a full coma and nine months of in-patient rehab, my brother made a full recovery, no loss of function at all. He'll have plastic hardware in place his whole life, but other than that, no problems. The hardware actually survived a fairly serious motorcycle crash years later (and yes, he recovered from that too
.))