He seems like a good man (or, really, men) with a tragic side.
He got lost on 20th century Earth for nearly 3 decades. He was faced with a future self whose career and life was ruined by Janeway's time travel antics. And while Starfleet tried to re-integrate him, they could never heal all the mental scars of the paradoxes he bacem involved in. Out of a sense of duty, he agreed to stand trial for crimes his future self committed.