There are thousands of good reasons why magic doesn't rule the world. They're called Witches and Wizards.
Terry PratchettMost of the great triumphs and tragedies of history are caused not by people being fundamentally good or fundamentally evil, but by people being fundamentally people.
Terry PratchettI would like permission to fetch a note from my mother, sir' Ridcully sighed. 'Rincewind, you once informed me, to my everlasting puzzlement, that you never knew your mother because she ran away before you were born. Distinctly remember writing it down in my diary. Would you like another try?' 'Permission to go and find my mother?'
Terry PratchettYou can't make people happy by law. If you said to a bunch of average people two hundred years ago "Would you be happy in a world where medical care is widely available, houses are clean, the world's music and sights and foods can be brought into your home at small cost, traveling even 100 miles is easy, childbirth is generally not fatal to mother or child, you don't have to die of dental abscesses and you don't have to do what the squire tells you" they'd think you were talking about the New Jerusalem and say "yes."
Terry Pratchett