It does not really matter if we agree with this rule or not, it is the law not to drive with fog light on if not in adverse weather conditions. End of story.
As somebody said before, it's the law, but hang on it's me so it does not apply.
I recently asked a copper why they don't pull over people for driving with their fog light on, and his reply was, and I quote "I can't be bothered with the paper work"

