Because he genuinely believes if he doesn't do it the next guy will do it worse.
The outcome is the same!
He can both believe that AND be the slime mold chief. His rationale doesn't excuse it - and worse this all degrades into a "trust me bro" situation.
Dude probably sleeps on a bed worth more than your networth.
You have no frame of context to understand his intent or legitimate worries.
The only applicable perspectives are to trust or apply logic. It is foolish to trust someone you don’t know who stands to benefit from lying to you.
Logic dictates that given the ungodly sum of money he stands to gain, he will lie to everyone who will listen.
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There’s an astounding level of arrogance required to believe he is somehow uniquely capable of bringing about a technology especially considering Anthropic came after OpenAI where he worked.