Excepting a few facts:
(a) FDR tells Admiral Richardson that even if Japan attacked WAKE, GUAM, ... the Philippines (slated to begin "statehood" path in 1946), FDR doubts the US will go to war,
(b) a certain "Blue Funnel" steamer carrying the secret British Cos (Chief of Staff) mail for Singapore is captured in the Indian Ocean in August 1940 by a German surface-raider; said minutes are translated and given to the Japanese, Japan learns that British will appease (think Burma Road) and not sent warships to be based in the Far East, it is already stretching the limits of Home Fleet; thinks about US, still a neutral, escorting convoys of war materiels in the Altantic,
(c) the Japanese know the Asiatic Fleet has as its singular (yes, just one) capital ship, a crusier,
(d) the Japanese also know that FDR sent to the Atlantic, in the Spring of 1941, about 25% of the Pacific Fleet to aid in that "undeclared war" ...
So, yes, the whole picture has many aspects.
One was that the IJN had one target; it was gathered tightly in one location. In fact a location checked via the so-called Kita Messages.
a. If Japan attacks the Philippines, takes Guam, or attacks Wake Island, we are at war, period. Attacking American bases, killing American servicemen, and landing troops on our territory is not an incident, it is an overt act of war. Even the most die-hard Isolationist could not ignore that.
b. Name of ship please? Also, it is not exactly a secret that the British were stretched thin in late 1941. That is one of the reasons Japan attacked. If Britain is not at war in Europe, then a Japanese attack on Malaya and the Dutch East Indies is suicide.
c. Cruisers aren’t capital ships. The Asiatic Fleet had two cruisers assigned, USS Houston (CA-30) and USS Marblehead (CL-12), a third cruiser USS Boise (CL-47) was present near Cebu having escorted a convoy of reinforcements from the Hawaii to the Philippines and came under operational control of CinCAF. A fourth cruiser USS Pensacola (CA-24) was en route with another convoy of Army reinforcements to The Philippines on December 7th 1941..
Japan knew that the Asiatic Fleet was weak, so did we. That’s why Hart had the option to withdrawal South to the DEI when he wanted to, so he could link up with the Royal Netherlands Navy, Royal Navy and Royal Australian Navy forces to combined their efforts.
d. So did everyone else, and the Japanese knew it was only temporary. The Two-Ocean Navy Act had a lot of Destroyers for the Pacific Fleet included as part of the build-up.
FDR had no reason to set up an attack on Pearl Harbor, since Japan was clearly bent on war anyway.