I like this C.S. Lewis quote because it is so true:  
"
Of all tyrannies, a tyranny sincerely exercised for the good of its
victims may be the most oppressive. It would be better to live under
robber barons than under omnipotent moral busybodies. The robber
baron's cruelty may sometimes sleep, his cupidity may at some point
be satiated; but those who torment us for our own good will torment
us without end for they do so with the approval of their own
conscience."