Well... The Ideological Left rests entirely in relativism.
And Relativism is the doctrine which holds that knowledge, truth, and morality exist only in relation to one's cultural, societal, historical and personal context, and, as such can never be the result of soundly reasoned absolutes.
It is through this deviation in reason that relativism axiomatically rejects the objectivity which is essential to truth.
And with truth being essential to trust and, both of those being critical to the establishment of a soundly reasoned morality, and because a soundly reasoned morality is essential to Justice... it becomes clear to reasonable people, that Relativism can never serve justice.
So... the Left has no sense of truth, what it is... why its important, why rejecting it leads to chaos, calamity and catastrophe.
Which makes then the perfect instrument for the purveyance of evil... so, that's why the Left is always found either promoting evil or committing it.