Not cool. USA was already supplying literal ship loads of weapons to Europe (UK) before the pearl harbour thing. They were risking U2 infested waters to supply essentials.
Pearl Harbour didn't even necessarily need them to engage two enemies on two fronts. They could've just gone after the Japanese and not bothered with Mr. Toothbrush Mustache.
America was not a perfect nation, but good men within their powers tried their best.
How many died because Neville Chamberlain dithered about?
How many died because the Entente did not enforce German disarmament policy despite obvious violations?
How many people died because of the revanchist Versailles treaty?
If you are measuring by perfection, nothing ever will measure up.
No, America was not perfect. It could have come sooner. But so a lot of things could have happened.