Either that or all of you are all correct; the man is an idiot and he'll die within the second breath he draws, the instant his head is underwater ?
That's not what we believe nor is that how it usually happens. Whether it's diving or skiing or boating or whatever activity, the person who disregards the rules and/or engages in reckless behaviour *usually* gets away with it. Until one day they don't. That's what makes it so dangerous. If bad choices always met instantly with bad consequences the equation would be simple enough for anyone to understand.
It is true that certification and training offers no immunity. Accidents can happen to anyone. You can do everything right and still die. You can do everything wrong and somehow live. But I believe that if one is going to assume the inherent risk in this activity then one would be prudent to do the things that are commonly recognized to minimize those risks. Getting properly trained and certified is one of those things.
I'm not saying the son is going to teach him, much less save him on a Oh cra__! moment. What I firmly believe is that scuba diving can safely be an individual activity, a person can be responsible for him/herself (no if's or but's), can be safely learn, safely practice and safely enjoyed with out the benefit of formal training.
I agree. I am a strong proponent of self study. Some people have the discipline and judgment and skill to progressively and safely teach themselves new things. Most people do not. Not knowing for sure where the OP and his dad fall, I think it irresponsible to give him any kind of encouragement to do what he is wanting to do.