Perhaps, killing a lot more Nazis would have been a good thing for civilization.
I suppose that if Germany had the shipping to invade England and instead of turning towards Russia, you would have proposed not to fight them on the beaches. The Wehrmacht, if it could have gotten across the Channel after the Fall of France, would have gone through the UK like a knife through butter.
So why would the British bother to fight then? Give it up. The occupation goverment was already in the planning stages. Wave goodbye to your Jews also.
Why were there resistance movements in occupied countries? Useless, it would seem.