A couple of additional suggestions from me - ask questions in changeset comments rather than just say “X is wrong”**, include a “hello and welcome” bit if they are vaguely new, and perhaps something like “OpenStreetMap is a map of things that actually exist, not things that you would like to exist”. Also if the changeset locale isn’t English I’d perhaps add a second discussion comment translated by e.g. Google Translate into that language.
** which has happened in at least some of these examples, thanks.