"Or if certain cables warning of Japanese intent had beens een and acted on in a timely fashion"

Seen what? Acted on how? I've read the decoded Japanese cables, the key intelligence passed between Washington and Pearl and the orders issued all around during the lead up to the attack. They don't say anything tangible. Everyone one knew something was up, but not what. The possibility of an attack on Pearl was considered briefly but dismissed locally. Washington actually advised brass at Pearl to expect a Japanese attack on bases further southeast and ordered them to put their few patrol planes, the only chance they had of detecting the attack in advance, patroling in that direction, not to the north where the attack actually came from.

I'll see if I relocate a website that posts facimiles of these documents so you can see for yourself. Pearl Harbor might have been prevented if FDR wasn't so intent on getting into WWII and had pursued a less aggressive policy towards both Japan and Germany, but it couldn't have been prevented militarily short of some major good luck for the US or bad luck for the Japanese.