"The price for ridding society of bad is always high."

http://www.lettersofnote.com/2011/11/price-for-ridding-society-of-bad-is.html

“Dear Dennis,

The man who might have written on this card once controlled Europe — three short years ago when you were born. Today he is dead, his memory despised, his country in ruins. He had a thirst for power, a low opinion of man as an individual, and a fear of intellectual honesty. He was a force for evil in the world. His passing, his defeat — a boon to mankind. But thousands died that it might be so. The price for ridding society of bad is always high.

Love, Daddy"