“All creatures kill—there seems to be no exception; but of the whole list, man is the only one that kills for fun; he is the only one that kills in malice, the only one that kills for revenge.”
Source: Autobiography of Mark Twain, Volume 1 (2010), p. 312
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Mark Twain 637
American author and humorist 1835–1910Related quotes

“There is only one thing that can kill the Movies, and that is education.”
Source: The Autobiography of Will Rogers (1949), Ch. 6

See also "The death of one man is a tragedy, the death of millions is a statistic." (misattributed to Joseph Stalin)
Source: The Anarchist Cookbook (1971), Chapter Three: "Natural, Nonlethal, and Lethal Weapons", p. 79.

“The only solution for dealing with the IRA is to kill 600 people in one night.”
Spoken at a fringe meeting at the Conservative Party Conference, October 7, 1997. Reported in The Guardian, October 8, 1997 http://politics.guardian.co.uk/conservatives/story/0,,451799,00.html

“Only a persuasive tone can kill two birds with one stone.”