I would think Pascal's Wager can be applied to that. If Musk is wrong, being extra careful with AI will just mean slightly slower development. If he's right and we don't take it seriously, humanity is wiped out. Why take the chance?
Awareness of a risk isn't very helpful if it doesn't come with an understanding of the odds and the costs and benefits involved.
Clearly you have a different understanding than Elon.
End of humanity is in the grand scheme of things something trivial. It's just happens and then nobody suffers. so there must be a probability low enough to balance it out.