Playing With / Well-Intentioned Extremist

Basic Trope: Evil or amoral character with sympathetic and even heroic motives.
Should you not go back to Well-Intentioned Extremist, the world will no doubt suffer for it...and I shall see to it that you will not live to see such a tragedy take place.
http://tvtropes.org/pmwiki/pmwiki.php/PlayingWith/WellIntentionedExtremist