I believed that as well.
I also think that it's a reasonable argument and that you might be right.
My position is half based upon the war's consequences, with client status being one of them along with our replacement and how it relates back....and what the possible futures might have been.
While I accept that maybe I'm wrong let's consider some of the points that form why I now have major doubts over what happened.
It's certainly no endorsement of Hitler nor of pacifism and it's more related to should we have taken offered off ramps and was Stalin better than Hitler given the circumstances.
From what I've looked into in later life I've realise that what I was raised with was a 'take'..... it's one version of the truth.....Maybe it's the right one but other versions exist...and the access to alternative viewpoints wasn't easy to access.....alternative viewpoints that were being discussed even within Churchill's cabinet.
It's an extremely detailed topic but I'll very very briefly touch on several 'answers' to your points. One was that Britain was offered an alliance against communism (doesn't sound like an intention to invade). Countries that stayed neutral like Switzerland and Sweden were not invaded....though mainly this was because they weren't required for Germany's war aims.
Staying out of the war was a very real option for us......Like most wars it only brought ruin....and personally I think that's foolish unless the war is existential and for Britain it was a war of choice....For France as well as it should be remembered that France also declared war on Germany over Poland (though it was understandable)....Not the other way round......That said I also believed that Germany's motivation was to be the dominant force in Europe....(EU anyone?)
This is Grok's take on Britain as a target for Hitler before the declaration of war:
'Britain as a Target: Hitler’s attitude toward Britain was more complex than it was towards France. He initially hoped to avoid war with Britain, believing they could be persuaded to accept German dominance on the continent (as seen in his offers of peace during the Munich Crisis). However, contingency plans for invading Britain existed, and the Kriegsmarine’s expansion (e.g., Plan Z for naval buildup) was aimed at challenging British naval power in the long term. The invasion of Poland was undertaken with the understanding that it might provoke Britain, but Hitler gambled they would not act decisively.'
We attacked Germany first with bombing runs, they weren't looking for war with us. The decision to go to war with Germany over Poland (the route they had to secure to get at Russia) wasn't a defence of democracy as Poland was itself a dictatorship.
As for this freedom loss you talk about. Well, if Hitler had defeated us and occupied (which only didn't happen due to his timeline plans to attack Russia(his real motive all along)) then he'd have taken out the elites and Jews that's for sure...However, Hitler wasn't going to destroy Anglo Saxons (both are Germanic tribes), we would have survived and the country would have stayed Britain.
This is no defence of Hitler, his real plans were the elimination of Jews in Europe and to be the dominant power in Europe (which he wanted to unite) and the attack and defeat of Soviet Russia.
Regardless, now the next generation have a real existential mess on their hands and it may be lost already.