Mirrors have lits of uses, such as being a mirror, being shiny, scaring people in caves in SMP, directing light and by adding a slight reflection to all blocks lighting rooms will be much easier. And really, who doesn't want a castle completely covered in mirrors? And a mirror labyrinth! And a way to look at your own skin! I'm sure there is more as well.
Prove why they should be in minecraft and I will support this fail thread.
The pen is mightier than the sword, or in this case, the text is mightier than the troll.
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Apocalypse for the win.
Awesomeness for the win.
Spelling ,err-er-ur, error for the loss