Point is most of Europe convinced themselves Hitler would stop at Czekoslovakia, then Austria, then Poland etc....

Or to look at it in another way from inside the Nazi regime-

'First they came for the socialists, and I did not speak out—
     Because I was not a socialist.

Then they came for the trade unionists, and I did not speak out—
     Because I was not a trade unionist.

Then they came for the Jews, and I did not speak out—
     Because I was not a Jew.

Then they came for me—and there was no one left to speak for me.'

In Britain most politicians were in favour of appeasement of Hitler- because it would be easier that fighting him. It was only because Churchill dared to fight that Hitler was defeated- when Britain entered the war it was against huge odds. If Churchill had not dared to fight against the odds, where would you and your liberal democracies, rights and freedoms be now?

When thugs gain ground through aggression they seldom stop, until they are stopped. Putin is a thug and a despot and he is backed by China who have much wider ambitions.