As a teacher, I moved away from such statements and moved into the Socratic Method, which is based on questions, an approach which Christ also used as part of the Rabbinic way of teaching.
But, black and white rhetoric is not the same as black and white thinking. We live mostly in areas of tepid grays. Such b and w thinking is the fallacy of the false dilemma. We must say that as human beings our truth is limited by our perceptions, and our checks and balances, which is Revelation and Tradition in the Catholic Church, help us understand and clarify the grays. These "checks and balances" are one reason I am Catholic. We have a reasonable religion, unlike some based on fear or emotion, which allows for discussion and understanding our Faith to a point.
One of the reasons there are such divisions in the American culture is because of black and white thinking-I saw this last year in the disputes in Wisconsin regarding the budget repair bill. Even such movements as the occupy and anarchist movements are begun and inflamed by black and white thinking. So, how as Catholics do we fall into the fallacy of false dilemma? Christ did say "He that is not with me, is against me: and he that gathereth not with me, scattereth."Matthew 12:30 But, Christ, because He is the Way, the Truth and the Life does offer only one alternative to salvation. He is God.
I think the answer is simply becoming like Christ, living in and with Christ, allowing Him, as Ignatius states, to take all one's memory, understanding, and will. Only in the mystery of allowing the Indwelling of the Holy Spirit purifying the mind and imagination, the memory, and the will, do we grow in holiness. The dying of self, or to self, allows us to think and act like Christ. Then, the dilemma is solved. We can speak in black and white terms, but think without judging. This does not mean that we tolerate evil, but that we love beyond the actions of individuals. Therefore, we can communicate the Mind of Christ. To be continued..as one cannot confuse this Love with tolerating any type of evil. "But I have against thee a few things: because thou sufferest the woman Jezabel, who calleth herself a prophetess, to teach, and to seduce my servants, to commit fornication, and to eat of things sacrificed to idols." Revelations 2:20