Herbert Spencer, English philosopher and political theorist:

“The ultimate result of shielding men from the effects of folly is to fill the world with fools.”

Robertson Davies, novelist, playwright, journalist, and professor:

“There is no nonsense so gross that society will not, at some time, make a doctrine of it and defend it with every weapon of communal stupidity.”

Example: see “(external)”"socialism"":http://en.wikipedia.org/wiki/Socialism", as thoroughly refuted by Ludwig von Mises.