There can be a hallucinatory quality to the progressive mind, a tendency to see enemies in allies and demons in opponents, to imagine a public consensus for niche propositions and to experience even mild-mannered political disagreements as near-physical attacks. One or more of these behaviours can be found across the spectrum — lefties hate other lefties, righties hate other righties, centrists hate everyone — but it is in progressivism that they most vividly concentrate.