Every major horror of history was committed in the name of an altruistic motive. The most dreadful butchers were the most sincere. They believed in the perfect society reached through the guillotine and the firing squad. Nobody questioned their right to murder since they were murdering for an altruistic purpose. It was accepted that man must be sacrificed for other men.
Actors change, but the course of the tragedy remains the same.
A humanitarian who starts with declarations of love for mankind and ends with a sea of blood. Internet Law Library Ignorance of the law is no excuse.