Are there any material objects which are in and of themselves evil? Or is all matter morally neutral but capable of being used for both good and evil purposes?
I believe that there is no matter which is intrinsically evil, for all things are made of the same basic materials, their physical differences arising from their organization. In fact, the same object can be used for both evil and good, such as a knife which can be used in the securing and preparation of food or to murder someone.
If this is the case then we can only measure the relative good or evil of the effects that a physical object has when it interacts with other physical objects.
In the context of the evil of contraception, a contraceptive pill would then have evil associated with it only if and when it actually had a conctraceptive effect or was used with the intent of having a contraceptive effect.