I think the poor chap in the accident discovered exactly what the penalty for an error in judgment entailed
He had probably been told that leaving the aircraft running was a perfectly OK sort of thing to do without any emphasis on the reasons why it is sometimes necessary (as John Eacott explained).
Education not legislation would have helped here but, while there are the hairy-chested pioneers saying it is fine because they have been doing it for years, the newer pilots in the fold who aren't operating in the extreme conditions accept it as the norm rather than seeing it as a risky thing to do which needs to be justified in terms of safety vs risk.