One of Humanity's current problems is that it lives with the ingrained illusion that it has the right to survive by the simple fact that it exists, and that no further effort is required.
A large group of people can only survive with (somewhat) common goals, with a certain level of light threats to keep it awake, and with a clear understanding of personal rights, personal responsibilities, and - what is starting to disappear - an understanding of personal limitations, and the courage to admit that one has to trust the specialists for the things that one is not competent at.
Internet has made the World into the equivalent of a full-stadium Rammstein concert, packed to the gills, with EVERYBODY holding a microphone, plugged into the same sound system. And everybody is yelling.
With the pros' voices being drowned in the common crowd, the crowd will simply listen to whoever shouts the loudest, not to whoever sings and plays best.
The fact that this guy was allowed to go that far into exposing people other than him to such risk, is indicative of the currently prevailing malaise. He was allowed to think he knows, to get comfortable into thinking he knows, better than the people who knew basic engineering and physics.
The miracle in this story is that this wannabee didn't create a submarine holding 50 or 500 people, and that he offed just five. May they all rest in peace, and may his cauldron be warm.
PS: Another seemingly unrelated but at the end of the day - quite similar documentary is "Class Action Park". It's on that streaming service that starts with an H and ends in BO. Same story about hubris and not taking no for an answer.
I had never heard about that place. Highly recommend it.