Britain was only interested in surviving, not thriving?
In 1945 most of the empire was intact.
You seem to be substituting British pride for the cold hard facts. Not only did GB not come away from WWII with any additional gains, it lost colonies and was mired in debt and nearly bankrupt. Between 1945 and 1965, the number of people under British rule outside of GB itself fell from 700 million to 5 million.
I don't think britian would really have considered asking for their opinion.
Forcing other countries to fight for an oppressive ruler wasn't a model for success in the 1940's. Just ask Italy for verification.
Broadly speaking because the UK decided to invade europe.
Again. If Britain wasn't threatened by Germany, why not just fall back and sit out the war after the Battle of Britain? If you actually believe that Germany was getting weaker after 1940, and their ability to mount Operation Sea Lion at a latter date was impossible after the invasion of Russia, why bother with a 2nd front?
Again Germany had no real chance of a sucessful invasion of the UK.
Again. Germany need not have invaded to get the British government to acquiesce to their plans. The Germans already occupied Jersey and Guernsey. Why couldn't the Brits defend them?
Without Churchill Gallipoli would just be a place in Turkey and the whole Italian campain mess wouldn't have happened (it isn't the soft underbelly when it it is full of mountians).
Nobody said Churchill never screwed the pooch. The crap about the "soft underbelly of Europe" cost enormous Allied casualties.
Alturnatives to Churchill could have been found and the loss of Attlee would likely have been far more problematical.
If there was somebody other than Churchill ready to enter the breech after Chamberlain, they would have come forward. What other politician in GB could have manipulated FDR as well as Churchill? Not to mention Churchill was hip to the Soviet threat long before FDR.
I don't see any argument you put forward that negates the fact that Americans pulled British chestnuts out of the fire in WWII.