If health and safety were really taken seriously everyone on the aeroplane would need to attend an appropriate course prior to flying. The ability to follow instructions, operate escape doors, use oxygen masks, stay strapped in or not and respond to other possible in-flight issues all need more than a few words.

Without actually doing an activity, such as operating an emergency door, you cannot understand what is needed and be effective. But we do not require that so either the airlines are either being grossly irresponsible or they don't matter. I suspect the latter.