What could Britain do t prevent the rise of fascism in Germany and Italy?
Did any country in the world do more than Britain?
No, so that is not a fair criticism.

We were ill-prepared for war in 1939
Yes we were, and even more so at the time of Munich, because the Left persuaded us to disarm.

But still we made a stand in 1939, and in 1940 stood alone against them.