I have a theory. In GH's most recent video it states that there is a decently reliable source that the victims had possibly seen him earlier, and reiterated the term creepy. I am of the unpopular opinion that they had seen BG earlier and acknowledged that, in their opinion, he was creepy. Once again, reiterating that word twice.
Say BG is DN. DN is known to be unstable and explosive. Also he is known to live under bridges. I can't help but think maybe he was staying there, or at least squatting there, and when passed by the victims, heard them say something to the extent of him being creepy to themselves, and retaliated. They were correct if they did say he was creepy. But what if they said it out loud to each other just loud enough for him to hear, and he was set off?
In no way am I saying it is anyone but BG's fault, but we continually have this discussion whether it was premeditated and predatory, or a crime of opportunity. What if it is both? What if he felt they were judging him, and because he is mentally unstable he retaliated?
Either way, they sure were right to say he was creepy.
MOO