My Faith tells me that the use of sexuality is for marriage between one man and one women.  Because procreation is an indispensable part of human sexuality, it cannot be divorced from the other ends of sexuality--whatever they may be--unity, indissolubility, etc.  

Contraception, by definition, changes the entire meaning of human sexuality.  It turns sexuality on it's head.  Sexuality becomes no longer a gift of self.  

The Church cannot pay for sin, nor can she enable sin.  People who work for the Church know this.  If they have a problem with that, let them work for someone else.