If Harry saw his parents in the mirror and Ron saw himself holding the Quidditch cup, it could be a useful mirror. But Dumbledore had told Harry:
"it will be moved to another location and you must not go looking for it again."
Harry asked Dumbledore what it shows and Dumbledore said:
"it shows the deepest desire of our hearts"
So later in the movie when Harry, Ron and Hermione take a huge risky rescue mission to prevent Snape from getting the stone, Harry goes on after Hermione stays behind to help a knocked out Ron on the wizards chess.
So Harry went forward to find Quirrel in the chamber...and the mirror that Quirrel tried using to get the stone.
My main question is:
Why, when it was suspected that someone was trying to break in to steal the stone, that Dumbledore had moved the valuable mirror to there in particular?
It makes no sense to me as Dumbledore was supposed to be the greatest wizard alive at the time.
So why did he do it?