And what happened after 1945? Japan tripped over themselves kissing Americans' occupying feet. No one cared, ultimately. Only academics and peaceniks argue about the decision, not the mainstream of society or the political establishment. If you're looking for a precedent that an atomic attack will be condemned and vilified through history, the Nagasaki and Hiroshima bombings are not it.
Invading Taiwan conventionally is going to be ugly, no two ways about it. Demonstrating a nuclear blast off the coast, or using one against a single city and quickly inducing surrender would probably ultimately save time and lives.
Not this nuking Taiwan nonsense again.
The Japanese reaction to the nuclear attack was the result of a complex number of psychological factors, far too complex to get into here. But they were for all intents and purposes a conquered people after WWII, with an occupational army, foreign governor and a systematic 're-education' program to drill into them that America is right and they were wrong, with no-one ever saying otherwise.
With the way the bleeding hearts and downright haters in the western media have been going way out of their way to negatively portray China at every opportunity, 'free' media will make sure people will see the use of nukes as an unforgivable crime.
It is truly perplexing how anyone could not see that, never mind endlessly suggest it.
Besides, China does not need to resort to the use of nukes even if America gets involved.
Taiwan has no strategic depth, and China has had a very long time to study its defenses and topography. With modern precision, long range weapons, much of Taiwan's defenses would be neutralized in the first attack that could come with as little as minutes of advanced warning.
And before anyone brings up the build up time, remember that one of the reasons Taiwan is so nervous about Chinese missiles deployed across the strait is because they can be fired, from their bases and still can hit any target they want on Taiwan.
The ground and naval forces would take a little longer to get into position, but its not like the PLA is going to be sending in landing craft and paratroopers as the opening move of an attack. It will take the PLAAF and PLAN days if not weeks to clear away enough of Taiwan's defenses for it to be safe enough to launch the amphibious assault anyways.
If they were just put on heightened alert and only started mobilizing as the first shots were fired, that would still give them plenty of time to mobilize and be ready to do their part when the time comes.
Taiwan's air force is impressive on paper, but it is highly questionable just what portion of that air force will even be able to get off the ground or land again even if they survive combat against the PLAAF since their home bases would be near, if not right at the top of the PLA's targeting list.
As every war since the Gulf War has shown, without your own air force, SAMs and AAA will only ever prove as an annoyance to enemy air power, and when the enemy has air superiority, any large scale ground forces mobilization and concentration will prove almost certainly to end in disaster for the side exposed to hostile air attacks.
With its conscript army and rich urban population not used to hardship, there are serious doubts about whether the military and people of Taiwan has the stomach or capacity for a protracted guerilla campaign. What more, the PLA is one of the few organizations in the world with a positive record on counter insurgency, a job made all the more easy by the shared language and heritage.
Taking Taiwan will be bloody and costly for China, but it will never remotely approach costly enough for China to even have the briefest thought about nuclear weapons.
Those will only be deployed if a foreign invading force penetrated deep into mainland China and it looks like the PLA is unable to stop them conventionally and they looked likely to take over the country.
There is no military power on earth, no even the US, that has that sort of military power.