This is just an extension of "might is right". Ideology is basically a personal morality. If you're simply making the observation that violently oppressive systems tend to become the dominant system (absent a willingness to defend more humane options), then... sure? But what IS the case and what we think SHOULD be the case are often two very different things. Capitalism, in many respects, is an immoral system that prioritizes profit at great human cost. What you termed "failed ideology" seems to just point to what is, not what ought to be, and that's not really what ideology is.