But when those on the left promote their agenda, it's "the truth".
When the right does it, it's "Mud slinging", "Hate radio", "Fascism",
etc.

The mud slinging and hate radio merely
contribute to the polarization that fosters fascism.

Truth is subjective and elusive. People on both sides of every war are
absolutely convinced their particular cause is just.
Few people would ever passionately defend a position they felt was "untrue."
History judges who was wrong, because "history is written by the victorious."

Hate radio is a tool of the right.
Blind obedience to the supreme leader and
exalting that person to god-like, infallible
status (even going so far as to claim people who question the supreme leader's
judment are "unpatriotic") is a fascist tendency more closely associated with
the right than with the left. Mud-slinging is universal.