OceanGate guy is a good example, you can bet your ass that guy was out of control narc.

Where does this cross from delusional and arrogant into narcissism? Seeing as the guy genuinely convinced himself that his carbon fiber hull was going to withstand dives to the bottom of the ocean forever.

Hmm, now that I think of it, I guess that someone who only retains positive feedback fits the description of a narcissist.