To me it's not like the recovering alcoholic, although I understand your analogy. To me it's simply an understanding, but not one that informs future decisions. It is simply a retrospective understanding. It is like having a drink and then realising, or being labelled, as someone who has drinks. Will that understanding or label change or influence what I do? No, it is simply something that, if I think about it, I agree with: I am someone who drinks. There may be other labels that one is more likely to react to: "drinks to excess too often" etc, e.g. the worldview taken is actually damaging to you, to your loved ones, to those you interact with. If, for example, I was a nihilist who the more I read about it the more anarchic I got due to that understanding of what it entails then perhaps I would address it, as it would clearly be influencing me. But it doesn't (or at least not that I am aware). But if it did then I could imagine that the analogy you used would be more apt... one would always be a nihilist, but would have to curb the influence that those thoughts have on you. This, however, is true of any philosophy the understanding of which leads us into such destructive behaviour, and it's possibly only prejudice / blinkers that lead some to suggest it is part and parcel of, or even exclusive to, nihilism.