Do you think that's a good thing, or just a likely outcome?

Comments can serve as calls to action encouraging others to downvote or priming people with a negative or unintended interpretation of a comment - be it yours or that of someone else -that influence is something to be discouraged. This is not the case with all explanations of downvotes but it certainly describes the effect and often intent of the vast majority of "Downvoted because" declarations. Exceptions include explanations that are requested and occasionally reasons that are legitimately surprising or useful. Obviously also an exception is any time when you actually agree they have a point.