Churchill did want to fight Bolsheviks in the beginning, before it was his concern. He warned about their secretive empire after guaranteeing it to them by arbitrarily choosing nazis as the greater evil. The same nazis he helped put in power, and the same nazis he gained nothing by going to war with. Then not only did he let the commies he inexplicably favored over the nazis not only take Eastern Europe but physically helped them deal with various peaky civilians in their way. But after 50 short years of the National Security State they were gone, so woo-hoo.
“it was parliament that created the welfare state there just as it was Congress over here”
It wasn’t just Congress over here. President Wilson and FDR’s wartime powers carried an enormous load, and you can’t underestimate runaway executive orders. Then there’s the switch in time that saved nine. SCOTUS was a rubber stamp, but a rubber stamp that people unaccountably respect.
As for parliament, over there you must understand the executive branch grows out of the legislative. Not that it matters, because Churchill sat in both.