If it's holstered In a proper holster I really don't see what the problem is.
Safety wise, you're right, the gun can never go off in a proper holster. But just like proper table edicate, there is, proper & polite carry edicate. While you can't hurt anyone chewing with your mouth open and eating with your elbows all up on the table, it will make other people uncomfortable in public.
Same with carry. No one, wants to see someone else's gun muzzle, swinging precariously around a room. Secured or not. I personally, think it also tells of the awesome character of @Mark, for that while he knows, no one can see the muzzle in his pocket, he still shows concern for the general public and people at large.
Exactly the very kind of person who should be and we want, to carry a gun.
What I think is nuts are people who apendix carry, now that's scary [emoji14]
Lol'd. My wife carries appendix. But I have always thought her a little nuts, long before she carried a gun.