Democracy v. Terrorists

Will Saletan notes:

[I]f we don't like our governments, we can vote them out. We can't vote out terrorists. We can only kill them.

Eugene Volokh adds:

Can, should, and will. As they say, except for defeating the Nazis and the Japanese, killing the rapists or murderers who are attacking you, stopping North Korea from overrunning South Korea, and a few other things, violence never solved anything. (And, yes, I realize that violence alone rarely solves everything, and that some violence causes more problems than it solves -- but sometimes it's an important part of a well-balanced defense diet.)