Anyone involved with aviation activities, in air or supporting from ground, must be CRM trained,
If the Allies had waited until all pilots, navigators, radio operators, air gunners and bombardiers had completed CRM courses, the war would have already been over.
CRM is the greatest cottage industry con ever foisted upon aircrew. Zillions of $ have been made by eager beaver facilitators in dark briefing rooms on their Power Points, preaching to a captive audience of bored fartless pilots.
Seriously - my guess is the greater majority of pilots quietly accept CRM lectures as just another regulatory box to be ticked and then they get on with plain old fashioned common-sense in the cockpit