The carrier fleet being operational was decisive in preventing an expected Japanese invasion of Midway and Hawaii, and recapturing Hawaii from the American continent would have been very difficult, if not outright impossible. What if China had surrendered or made peace with Japan? What if Germany captured Leningrad, Moscow, and Stalingrad?

It wouldn't have mattered for the Pacific war, except by prolonging it somewhat. Even if Japan had conquered every single island in the Pacific and Indian oceans, as long as the U.S. government remained in control of the U.S. mainland, as it surely would have, it still would have had enough resources and industrial capacity to outproduce Japan in warships and other naval assets by orders of magnitude and eventually roll back the Japanese conquests by sheer overwhelming strength.

Germany arguably had some chance to win the European war, but Japan was doomed from day one.

Also, as someone has already noted, the greater importance of carriers over battleships in WW2 is itself known only from hindsight, and contrary to the prevailing beliefs of the time.

What if the Japanese nuclear weapon program had succeded?

Well, yes, you can always conceive of some deus ex machina. But it's implausible that fears about hypothetical Japanese superweapons would have influenced the strategic plans of FDR & Co. in 1941.

What if the public opinion had turned anti-war, as during the Vietnam War?

By 1941, FDR & Co. already had sufficiently strong grip on power that they comfortably knew that a war would allow them to seize complete control of the media (and all other means of propaganda) and ensure that this could never happen.

The point is that the "official historical narrative" is different in different countries

True enough, but thus typically has the form of the same official narrative with some additional spin, omission, and lying with regards to the relevant local details in order to accommodate nationalist sensibilities. In contrast, sensible, intelligent, well-informed, and yet radical criticism of the official narrative can be found, to my knowledge, only within the Old Right intellectual tradition in the U.S. (Which has been driven to the fringe for many decades, but its vestiges somehow still occasionally surface in the respectable public discourse.)

The carrier fleet being operational was decisive in preventing an expected Japanese invasion of Midway and Hawaii, and recapturing Hawaii from the American continent would have been very difficult, if not outright impossible.

American public opinion may have expected such invasions, but did any serious military experts? Earl Warren and FDR's political pandering is not really strong evidence of a serious military expectation. Obviously, we know now that the Pearl Harbor attack was at the outermost of Japanese logistical capacity - they never planned an invasion of Hawaii, much less the West Coast.

Given the history, we know that transpacific projections of land forces were very possible for the United States (Guadalcanal, Iwo Jima). Why would an invasion of Hawaii be more difficult?

As an aside, I agree that FDR courted war because he wanted to join the European conflict. Lend-Lease and escorting convoys were not the acts of a neutral party. Likewise, the raw material embargos on Japan placed that nation in an untenable position. I upvoted you for asserting that FDR knew that Pearl Harbor would be attacked in time to make changes to defensive preparations at that base. From FDR's perspective, a "surprise" attack that was a stalemate instead of a defeat would have served his political goal (war with Germany) just as well.