A security hole and backdoor is always a failure in a software product. Having someone else control your system is just about the worst you can get. It has nothing to do with relative definitions because it always degrades every other objective the project could or does have. If a model of leadership leads naturally and often to security holes, it is time to reconsider the model. If it is a common library, then it is even worse. Open source that is used widely is _even_ more important to protect because the impact can be so much greater.