Maybe Mars and Venus are there to teach us a lesson.
Mars and Venus are just outside the Goldilocks zone.
Too hot; too cold.
Atmospheres too thick; or too thin.
And how fortunate we are where we are.
Mars and Venus could be there to teach us a lesson;
to help us ponder, rejoice over and express gratitude
for our merciful and still mostly pleasant location in which we dwell in the Solar System and cosmos.
You could consider your existance and habitable cosmic location as ultimately meaningless and capricious when viewed over the timescale of millenia and aeons, Nick, but I don't.