The more that comes out, it begins to seem like an extended murder/suicide pact. On the other hand, he likely just believed in his hype and really thought he could slap it all together. Tragic.
He seems to have really thought he was smart enough to outwit all the engineers who told him not to. He called it "innovation" but to others it looked like hubris and delusion.
Even if he had used a safe submersible it would still have been a very risky business to take tourists down there. Experienced submersible pilots have ended up in trouble around that wreck site because the currents are strong and unpredictable and it's easy to become entangled in the wreckage.
It just goes to show that you can bullshit, bully & fire as many engineers as you like but you can't bullshit physics. There's no talking your way out of being crushed at depth.
The hubris that people like that guy have, precludes them from having any doubts about their judgment or ability, while seeing anyone with a contradiction opinion as "just not getting it".