Another humble SLF here.
Firstly, I'm interested in the fact that what appears to be a brand new engine goes TU. I'd certainly want my money back, or a new engine gratis, and am interested in the question about who coughs for the replacement and if there is are x amount of hours whereby an engine is considered to have endured the aeronautical equivalent of 'fair wear and tear.'
Also, this is just a personal view, but when I board a plane my life is in the hands of the Captain. I assume my Captain also values his life and wants to get back in one piece to his wife and kids and Rolex collection as much as I do (although I lack the Rolex collection).
Therefore, rightly or wrongly, I trust the captain to make the right decision and it seems to me he made the right decision.