I don't really think that's fair.
I seriously wonder if saying things like (contraceptors) resent the unborn child for intruding itself upon their lives, and they turn to the solution of abortion makes her lose all credibility.
Think about how many couples you know who were surprised by a new life. Are their children really loved less?
I know there are many who disagree, but I think if NFP is to be discussed at all, it should only be in a religious context. There is no point to giving non-religious reasons why NFP is better than condoms, because nobody can go inside a marriage and deem one couple's motivations pure and another's selfish without first defining God's wishes for the couple.