**by Don HermanColumnist** THE LOW LIFE OF A LOW LIFE. A young NYPD Officer, Jonathan Diller, 31, was shot and killed this week doing his job. Protecting us. He was everything you would want in an officer. He loved his job. He was dedicated and considered “A cops’ cop”. His enthusiasm and dedication carried over to his family. He was married with a one-year old son. A wonderful future ahead of him. The pain of loss is so painful. And personal. Some people adjust, some never recover from the loss. There’s no right or wrong. Unfortunately, I can speak from experience. I lost a wife, daughter and…