Fortunately, capitalism is a fairly young system & requires a government to provide violence (police & military) to preserve it. Capitalists often ask government to step in and make capitalism viable long-term. That is, keep capitalists from destroying each other. And to keep the populace from trying alternatives. ("Revolution.")

Slavery was more stable: lasted millenia. We're in turbulent times, particularly since we're probably ending neoliberal capitalism: an unstable form of capitalism whose one advantage is to damage the imagination enough to stop seeing alternatives except a single bad one.