That person who is afraid has to understand that we are not talking about Italian Mafia, and witnesses these days won’t end up in cement.
Also, there are witness protection programs, and they work.
But, first, the witness himself may be unsafe if the perp guesses who the witness is. So the witness’s only protection is to spill the beans, so to say.
Also, till this is walking and is not arrested, no child, no woman in Delphi, in Purdue, and even much further, is safe. BG may come across as OK, but he is a madman, and does not belong to any community.