Sandy Davidson always gets me. There are many more I spend way too long on Websleuths Missing and Coldcase forums.
Me too !
However, I understand one way of getting answers is to keep trying.
I remember the story of a British girl Lindsay Ann Hawker , who was murdered in Japan. Her Dad never stopped looking for her murderer. He spent lots of money going over there. Learned to ask the question, 'Have you seen this man ?' in Japanese and he didn't care if he looked like a crank.
He kept on. And on. For nearly three years.
The suspect was found. When the plastic surgeon he paid to alter his appearance heard about what happened.
The case went to trial and her Dad was glad he would never have to say, 'have you seen this man ?' in Japanese ever again.
Some cold cases are solved after many decades because people either can't or don't or won't forget.