I agree with your opinion regarding the wisdom of carrying in appropriate, quality holsters. (That applies whether carrying openly or concealed.)
I carry concealed, typically in an OWB holster with concealment. But that holster is Level II retention. I'm around kids a lot - my own, my girls' homeschool group, church, etc. Sometimes very young kids. I'm more worried about accidents than I am about intentional/knowing theft attempts.
I would prefer to see more people carrying in good-quality holsters. But I also believe in freedom. I fully support all law-abiding people who choose to carry, regardless of how they choose to carry. If their choices incur risks, then those people, alone, bear those risks.
I didn't say we should ban open carry or dictate the means and methods. I just made some personal observations and shared an opinion on what I think is or isn't a prudent way to go about it.