Democracies are literally saint, nobody is going to show you american business helping with german rearmament or show real reason, why France and Britain willingly feed Austria and Czechoslovakia to the Reich.
There is no 'willingly' about either case really. In the case of Austria, France was in the middle of its usual 6-monthly government crisis and the British were not going to go to war to prevent a bunch of Germans led by an authoritarian dictator swallow up another bunch of Germans led by an authoritarian dictator (however flabby that dictatorship was).
In regard to Czechoslovakia I'm sort of assuming you mean Munich. Daladier was very depressed by the whole affair and, when confronted by cheering crowds in Paris muttered 'the blind fools'. Chamberlain was more carried away by the public affirmation that he had avoided war, the telegram from Roosevelt (Good Man!) sort of underlined it. Britain was simply unready for war in 1938, as was France. Not only did London fully believe the German propaganda (whipped up by Churchill) but also only one Dominion Government, New Zealand, said they would back Britain up if it came to fisticuffs. It was not willingness, more resignation and a desire to avoid the horrors of the last war.
Then there is the curious case of the Soviet mobilisation to assist the Czechs. Although Voroshilov claimed to have done it, the French Military Attache travelled to the districts where this was said to be taking place and found no evidence of military preparations. One of the issues nagging at the French was whether this was real or simply a bluff, and whether Romania or Poland would allow the transit of Soviet troops into Czechoslovakia. Chamberlain, instinctively hostile to the USSR, did not believe or trust Moscow for a moment. What is pretty certain is that the USSR becomes convinced that the democracies will simply fold every time and drop the whole anti-fascist/popular front/League of Nations approach of Litvinov in favour of trying to keep Hitler off their backs as long as possible whilst building their own strength. Ironically, Hitler believed they would fold every time as well.
Besides, the Democracies did, generally, behave themselves. Primarily because they benefited from the existing order in the thirties and did not want to rock the boat, whether it be France, Denmark or the USA. It was the desire of the two other ideological groupings to overturn this order and the last effort by Britain and France to defend it that brings about war. Democracies do not tend to go to war against each other: the last time was in 1941 when Britain declared war on Finland, in solidarity with the USSR.
K