But the one explicit thing about the Mirror realms is that people are not
people. They may look like people, but they behave like monsters or perverts, every single one of them. Well, except perhaps Smiley.
The point of "Parallels" was that everything that can happen, happens. "Confluence" in the Mirror episodes is just a single point, something one can easily achieve with an infinite selection of parallel universes; go back or forth a few decades, and the Mirror universe bears no resemblance to the "main" one again... (But a slightly different Mirror universe will provide another intersection point for another episode.)