Respectfully snipped because this part of the post resonated with me...
If you follow the Molly Bish case out of Massachusetts, which is similar to Delphi in that a young girl was abducted and later found dead in a wooded area, you may know that yesterday after many years a suspect was finally announced in the case. This individual died in 2016 but has been under posthumous investigation for about three years now. Some people are saying things like "I don't understand why LE wait until these people are dead to announce that the case is resolved. Have they messed up the investigation so bad that they are they just pinning it on a dead person to close the case, or...?" For this particular suspect, the tips that were corroborated apparently didn't come in until after he died. And the most likely reason for that, is that whoever had information on him - probably a member of his family - did not want to deal with the repercussions and potential interpersonal strife over tipping him while he was alive.
So how does this relate to Delphi? We have to hope that if there is someone out there with information on the Delphi killer, whether that's something that they definitely know because they recognize him, or whether that's because they are thinking about a story from around the time of the murders that now doesn't add up, that they are willing to risk turning this tip in. Because sometimes it truly is not easy for people with information to make that leap, as it could change everything about their world as they know it if they are correct.