Good day. My 2 cents...

I think the conspiracy theory is for those who couldn't admit that the US was caught with its pants down in Pearl Harbor due to bad luck and incompetence. No we're too good for that. There must have been a conspiracy.

The main argument being FDR wanted the US to unite and go to war so he let the Japanese bomb PH. Well all the Japanese needed to do was to attack a US interest and bingo the US would be at war. It didn't have to be the complete surprise behind-wupping in Pearl that it turned out to be. They could have been ready and they could have successfully defended themselves and the US would still get into war.

There was no conspiracy. Incompetence maybe. A bit of superiority complex, sure. Bad luck and miscalculations, definitely.