Are you crazy? Yeah! But, aren't we all?
Seriously, the guy putting his 5 year old in the pool on his spare air does lack common sense. I think most would agree.
However, I think a lot of folks would consider scuba divers crazy (& lacking common sense) for strapping a tank of compressed air on their backs and jumping into the ocean. Somethings are relative (no not crazy relatives) ---relative in terms of your perspective.
We all are capable of doing crazy things or having lapses in judgment. Hopefully, we'll all live long enough to learn and survive. Those that don't --- we'll some mistakes you only make once***.
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***Just please, don't drag anyone else, like a 5 year old, into your mess.