I don't see insurance as being any part of this. It's what we should all do whether required by law, club rules or any other coercion. If someone is in your aircraft you should brief them on normal as well as the abnomal and what you expect of them and what they can expect from you. It's the way I'd like to be treated so I do it to others.
ps. ANO 2016 The pilot in command must ensure that before or, where appropriate, during the flight, passengers are given a briefing on emergency equipment and procedures.