What's Mallard raving about today?
Liberals. Pie throwing.
I won't speak for all conservatives, but the fact that the actions of a few pie throwers is conflated to represent the attitude of every single liberal in the world explains why Mallard would be considered closed-minded.
And congratulations to the liberals = free-speech-enemies topic for its second appearance, making it equal in importance, in Mallard's mind, to the Mark Foley scandal.