The point of the quote you are using is that judgement should be left to God and not man (the statement itself is kind of judgmental but I guess that's accepted because Jesus and God are both part of the trinity in Christianity). If you subscribe to that theory of life than more power to you. I do not. I have no problem passing judgement on someone who killed an innocent young woman and honestly my experience is that most Christians will pass judgement on a person for far less.