Well, I'm of the opinion that the point of no return doesn't guarantee a successful outcome but is your absolute last chance to turn around if things don't add up. After you cross it, you are committed no matter how things change with the fuel/wind etc.., because you won't make it.

So if things look alright 45 min prior and then again as you reach it, but then change for the worse 5 to 10 min later you're committed because now you can't go back because it's closer to continue.

And I bet that's a lonely feeling out over the ocean, by yourself when you know you're gonna get wet and you're 5 plus hours from land.

We don't know what happened, therefore it's impossible to know what he may or may not be guilty of.