Seeker Two, the primary reason is that it will often violate Rule #1 of safe gun handling. Standing in a bay at my range, pulling my firearm out of my shoulder holster, I start with the muzzle pointed at everyone behind me, I then sweep it over everyone to my left, as I'm a righty. And while everyone here knows they, personally, are perfectly safe, nobody trusts that stranger three bays over to be safe, which is why I'd keep a slightly more watchful eye over anyone with a shoulder holster, or a cross-draw, etc. etc.
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