I think these people stalk bts just for the "fame/followers" tbh. I've noticed from fans who say they "coincidently(lol) met them" tend to embellish their stories. They just want to be a known fan and have people fawn over them. I guess bts' privacy and safety is less important to them.
¯\_(ツ)_/¯ I wouldn't put it past this fandom