How did the delegates go to the munich conference after the found out they could not trust hitler

In Munich conference (international conference: Germany, Italy, France, Britain) Hitler required Sudentland (western part of Bohemia, Czechoslovaquia with significant German-speaking population) and asked consent of these three powers. Italy, Britain and France agreed in fact hoped that like that Hitler´s hunger for power will be satisfied. Contrary proved to be true: Munich conference took place in October 1938. Already in March 1939 German army entered Czechoslovakia, occupied all the country and proclaimed "Protektorat Boehmen und Maehren (Protectorate Bohemia and Moravia).

Explanation: Hitler´s behaviour on the international scene proved to be false and British policy of "appeasement" (prime minister Neville Chamberlain) ineffective.

are there any options?

answer; personally distressful;