Anger almost always reveals an unconscious truth and as a general principle is an agnostic omnipresence across interpersonal and complex (intra- or inter-system) psychological and social dynamics. Extrapolating on this: the generation or cultivation of frictive behaviours or narratives forms the basis and constitutive self-validation of a largely and autonomously self-propagating neurosis.
The pathology is one in which ideologically-based paranoiac assertions of self-identity manifest in, through and as an obligatory belligerence because the difference, distance and insecurity thus generated forms the optimal transmission medium and necessary uncertainty (or perceived threat) for behavioural and ideological self-replication. Cultivation of perceived offence or threat is the natural environment of an(y) ideological neurosis.
An identity (at any scale or measure of complexity) thus constructed can only ever seek (and cultivate) the antagonistic environment it requires to persist. If you want to unveil the weaknesses of a person or a conceptual system – observe what irritates and angers them. Every political or otherwise tribal specific instance is a singular facet of a distributed, systemic property and principle and it is – quite counter-intuitively – to our collective human weaknesses that we must turn to unveil or set free our strengths.