If this was a one-off event I suspect the CAA may have opted not to prosecute given the successful outcome. However, it seems there is more to this story than this rescue event given the other cases investigated and, IMHO, they are given little choice as the Regulatory Authority.
Sad outcome but maybe whoever made the anonymous tip alluded to in the article can also look themself in the mirror and like what they see; especially if they had tried to address concerns previously to Mr A.