I am a humanitarian aid worker working in emergencies with a decade under my belt. I am not saying civilians are not useful if they are properly trained. First aid courses that are not advanced, often repeated can help but it really is nowhere near enough to think you are ready to even halfway towards the front lines. Often simple first aid courses can also make you think you know more than you do. That also commonly coincides with attitudes where people are not listening.
I just have absolutely too much experience with people making bad situations worse with their actions. And even some people causing emergency situations because of what they don’t know. But I do not disagree with you. I think we are talking about two different things. I am talking about normal first aid courses people take every couple of years what you are talking about is actual advanced first aid courses that properly teach emergencies, how they work and how you need to act.