I don't think we should be too quick to judge people who wear armor. Honestly, some people see gun owners in general as paranoid and we do promote the ability to defend oneself.
I used to work armed security and had a Kevlar vest. I wore it when I worked. I do still occasionally wear it. In particular, I wear it at an indoor range nearby because I personally do not like the place for many reasons. I wont go into all of them, but they do book multiple people into lanes and rent guns. I have seen some people holding guns sideways like a "gangsta" and I couldn't imagine they have taken safety classes or at least do not take it seriously. In addition to that, over the years they have had people come to the range, rent a gun and commit suicide. I actually had a worker there make fun of me for wearing my vest asking if I thought I would be mauled by a bear or something where I specifically pointed out the suicides at their location. He was quick to drop the subject. I typically do not go to that range and avoid it as much as possible but I have shot some matches there and I have also trained friends there because that was a nearer location to them than my preferred ranges. I have only gone there a handful of times over the years.
Many people have the luxury of their own range or a range/club where they know everyone there. Living by a major city, I feel more comfortable wearing the vest when I am around guns, people I do not know, and people who are shooting unsafely. Same goes for if I am teaching someone who has never held a gun before. Accidents can happen and if I have the means to prevent it, I will. I of course go over gun safety, but if you can tell me you have never in your life thought that at a public range that someone has never accidentally had the barrel of their gun point at you, you are lucky. I already have the vest, doesn't sound like a bad idea to use it in this situation. These things happen and albeit however rare, we collectively tend to not overlook the improbable.
I am only saying, we shouldn't be quick to label a practice we maybe don't understand, the situation or the use. Especially in regards to safety. Just wanted to give an example that I think you could empathize with.