That's a good observation.
Conditions are what cause different kinds of governments to arise, not idealism of itself.
The repression of free exchange of ideas is like the repression of relgion or of democratic thinking the Soviet Union.
What is to fear if one is doing the right thing, compared to the danger of repressing the free exchange of ideas?
People should remember that we often bring about the very thing we most fear by being too much afraid of it.
It's well known that Hitler rose to power largely because of the desperation of the German people, who were suffering from the corruption and ineptitude of the Weimar government, hyperinflation, the threat of Communist agitators from the East, and the stupid insistence of France that Germany repay war debts they simply could not meet.
This is not to excuse what happened, but simply to point out that it's not smart to back desperate people into a corner. The allies pushed the Germans when they were hungry, weak and desperate, and then they made the opposite mistake and tried to appease them after Hitler came to power.