Gangs of New York's Bill the Butcher is considered one of Daniel Day-Lewis's best roles. Yes, there are wonderful performances from the likes of Leonardo DiCaprio, and Martin Scorsese's direction can't be out done. But Daniel Day-Lewis brought honesty and a ruthlessness to Bill the Butcher that no one else could match. But what exactly makes Bill the Butcher in Gangs of New York so terrifying?