I sympathise with the problem as you state it, but don't know enough about the particular circumstances to know if that is a fair summary or what you would be best doing about it.
Personally I would have preferred if you had mentioned the context in the original post in something like the format of: This thing happened [link and explanation], are we ok with this form of moderation being the norm on here?
Describing the issue in a very abstracted way gives an impression of subterfuge, and makes people feel excluded from the discussion.
I don't disagree with any of that; I just don't know if I'd get as much criticism had I done it that way, or if I'd just be told, "HOW DARE YOU SPREAD THAT CONFLICT TO THE REST OF THE SITE YOU F***ING TERRORIST!"
In light of recent (and potential) events, I wanted to start a discussion here about a certain method of handling conflicts on this site's discussion threads, and hopefully form a consensus on when to use the measure described in the title. Even if the discussion has no impact on site policy ("executive veto"), I hope administrators will at least clarify when such a measure will be used, and for what reason.
I also don't want to taint or "anchor" the discussion by offering hypothetical situations or arguments for one position or another. Rather, I simply want to ask: Under what conditions should a specific poster, "Alice" be prohibited from replying directly to the arguments in a post/comment made by another poster, "Bob"? (Note: this is referring specifically to replies to ideas and arguments Bob has advanced, not general comments about Bob the person, which should probably go under much closer scrutiny because of the risk of incivility.)
Please offer your ideas and thoughts here on when this measure should be used.