Well typically murderers don't order victims by phone, no, unless we're counting delivery drivers maybe, but that just means civilians "need to have it when they need it" more than the people who get advanced notice.
Do you really think victims of violent crime don't need or deserve to protect themselves, simply because their job isn't responding to others being victimized? Why do you think cops, which have less training hours than cosmetologists, are superheros somehow better than other civilians?
Btw I'll give you a tip, usually the guy with a gun you have to worry about isn't "some dirty prole open carrying," it's someone concealing it illegally and you'll never know until it becomes a problem. Most legal carriers also carry concealed, so that dirty prole behind you in line "without a gun?" You can never be sure, he may in fact have one just under a thin layer of cotton/polyester blend.
Is it so hard to imagine that some people are made to feel less safe being around people with guns, and would like to avoid it where possible?
Tbh, yes. If you live in America and don't just "work, home, sleep" (if you go anywhere in public, a mall, the movies, church, anywhere) you likely pass a person with a gun at least one time a day and never even know. Being scared of everyone with a gun is honestly more irrational than just being scared of everyone because they could have a gun. I for one choose not to live my life in fear, if I see a person open carrying I just say "ayy cool is that the p365? How do you like that thing? I had to replace my p320 and got a p10c instead but I've been thinking about picking one of those up" and now I have a new, albeit "dirty shirted," friend.