I'm.I'm.sure, im in two minds.
Part of me thinks, its not all his fault because nobody explained to him the difference between "having direct knowledge" and "knowing somethumg because someone told you".
But the other part of me thinks, maybe his ego got in the way. At the time, I can well imagine he was gung-ho about providing witness statements for criminal court. Never stopping to think, use caution and take responsibility for what he was doing- even though colleagues around him were doing just that.