Actually, Liliane, Professor Kempten does not suggest prohibiting contraception, but rather that the Church and her entities not be forced to pay for it.  Practice contraception if you want, if your conscience will permit, but be prepared to pay for it yourself.  And, if you cannot afford contraception, then perhaps the best solution is abstinence.  The exact same can be said for abortion - pay for it yourself, do not demand individuals, companies or churches that are utterly opposed to abortion, to fund it.

Moreover, for 2000 years, abortion has been understood to be nothing more or less than murder.  Couch it in whatever pleasing terms you like, it is the deliberate and premeditated taking of innocent human life.  The intentional taking of innocent life is always a moral atrocity.  Of course, it should be prohibited, just as all murder is prohibited.  Women do not get a free pass to murder just because they are women.