Most people are not 'good', or 'bad', e.g. Lyndon B. Johnson might have done 'good' things in civil liberties issues, but, at the same time, he masterminded the JFK assassination, and, most probably, was also involved in other murders (not to mention corruption and bribery). John F. Kennedy, on the other hand, I would call a mostly good person, who not only genuinely cared about people, rescued many sailors of his boat in WW2 while risking his own life, and who wanted to end the Cold War. At the same time, however, he was a womanizer, unfaithful to his loving wife, and also got elected thanks to mob involvement in the presidential election 1960.