And if scarcity prevails - then there must be struggle and war. So too with honor. Hobbes wants to eliminate honor from political competition and yet protect wealth, but increase it for all. But moderns seek to overcome scarcity of wealth and eliminate honor, and thereby achieve political stability. He finds insolence, fear, superiority, contempt, disproportionate growth all as causes for civil war.
Specific causes are work in Oligarchy and Democracy.
In Oligarchy, the immoderate action of clique or dynasty with palace coups - personal rivalries, or excluded wealthy, cause dissension or may provoke popular uprising due to the corruption of few and abuse of many. The great task is that of stabilizing regimes, which involves moving towards polity. Here are Aristotle's basic principle for stability - the stronger element should be for regime but as many elements as possible should be blended in. Again this calls for prudence of statesman. It calls for proportion again, and is not set in a formula.