I kind of agree but if an incident happens on a site where the shooter wasn’t paying attention to training and never attended the initial safety briefing then that’s their own problem.

Working in construction, if I never turned up to a health and safety briefing ( and let me tell you they’re repetitive as fuck) and something went wrong but my excuse was “I didn’t need to go cos I’ve been to these before” it wouldn’t go in my favour whatsoever. I don’t think it’s a reasonable excuse either. If there’s potential for lives to be at stake, you should be paying attention. At the very least, even if not for other people’s lives, just go so you can say you listened and followed every instruction but the mistake still happened. That way youve covered your own back.