Indeed. Most people know the name Winston Churchill but I wonder how many ever heard of Sir Oswald Mosley.
Much as you or I might disagree with these people they must have the right to state their case providing there's no violence involved. That's the whole point (& problem) of living in a democracy.When you realise all this perhaps my scenario of 'what might have been' doesn't look quite so fantastic after all.
As you only infer by the entry, the U.S. still has its communist, nazi and fascist elements, amongst others; certainly the same for the U.K.
Please don't forget the contribution of the British Empire. Thousands of Australians, New Zealanders & Canadians (not to mention volunteers from all over the Empire) came to serve Britain in her hour of need. I'm ashamed to say that in many cases their help was abused & they were sent on impossible missions. Without them it would have been a very different story. Just an example.
To bolster the example, although I intend the (past) leadership no shame, when the controversy about A.Roy Brown's WW1 'victory' of M.vonRichthofen began, another ace pilot stated that, had "he [Brown] not been a Canadian, there would have been no questioning of it [the victory]."
Additionally, VE-Day did not end the war for the British (nor for the USSR nor even the French). Australia, New Zealand, etc.(...

...), were part of the United Kingdom -- in such respect, the U.K. was still fighting for its homelands. I almost posted this without the intended emphasis that, obviously, the United States was not the only major, effective force against Imperial Japan right to the end of the war.