[Entropy Squared]

Leftist radio shows cannot afford to allow reality and facts to become part of the mix by allowing non-lefty callers

Exactly so. Leftists must always deny their political roots and hide their actual agendas. Talk radio that allows normal people to speak and to question the leftists' dogma is toxic to the inherent deceits of leftism.

[GeronL]

They create a bubble of nonsense and allowing a caller to pop that with truth ruins their show