[GeronL]

yes, but a lot of people will see two evils and recoil, why choose any 'evil' at all

[Tuscaloosa Goldfinch]

Because by choosing the lesser I avoid the greater. Otherwise, I'd be stuck with the greater.

[Texasforever]

why choose any 'evil' at all

Because it is a silly cliché' that has no practical meaning in the real world and especially politics. Every United States President from George Washington to George W. Bush has had some element of “evil” in their make-up.