Something isn't right in this. It seems your bowing down to fear, to allow this to go on another day. Yes people are demon possessed in their minds, a lot are mentally ill, and a psychiatrist could lock them up, with this kind of evidence. IN our town the police are allowed to commit involuntarily up to a month, in a psychiatric ward, for evaluations, and upon that , it is not guareented they will be allowed out into society if they pose a threat to it, self, or others. I am a little questioning your post, because people don't allow this evil to take the upper hand. We are the head and not the tail. Even tampering with mail, it is a criminal offense which will incarcerate a person, but what your explaining dosn't sound realistic. If your afraid of these people, then your not in faith, and allowing this to be taken into your own hands. I've dealt with demon possessed people, who even now are not to far away, but no person is a super hero, and no you shouldn't let this pass. Prayer, the holy spirit will lead you, and show you what to do. I had people tell me things that were going to happen with others and they didn't even know them, their words came true, because the HOly Spirit speaks, he is the opposite of the evil spirit. If you quote scriptures that is the weapons of warfare, fast against this, but in no means, let it go without getting help. If something happens to you, or your family, and you never filed any reports, no one might blame them even though they should be put in jail, today.