What you can't reasonably argue though, is that they tried to really help Poland in the beginning of WW2The UK allied with Poland in an attempt to contain Germany, as I've already said. It's normal for countries to make such big gestures in their own interest. Should the UK have just allied with Poland out of a sense of charity? What in particular had Poland done for the UK before this time, to demand the UK's unquestioning selfless military intervention? What became Poland was, after all, part of the central powers that opposed the UK in WWI.
And, like I said, no-one knew how rapidly Poland would fall under Blitzkreig; the mobility of the German armies was still not countered by the time they invaded France months later.
The war was immenent, and everybody seemd to know that except for Chamberlain.
Chamberlain was buying time to rearm the UK. I've always found it amusing that people take the position that the UK is responsible for 'letting Germany annex Czechoslovakia'. Apparently the other powers in the region didn't have a moral responsibility to protect an unrelated central European country, only the UK.
One wonders, if it's all about morals rather than capabilities, why Poland didn't step in and prevent Germany from annexing Czechoslovakia?
There was no real plan to take the Soviets on, because the Allies had no real stake in it.
The rest of the Allies had a huge stake in preventing the Soviets from dominating Europe. They just had no way to feasibly follow it through.