Here is the basis of the problem. The right feels that human life begins at conception and feel that their thinking has to be the only thinking. They cannot allow any option other than nothing. The left feels that it is a person's choice, and if they feel it is wrong, then they are allowed not to. The rights choice doesn't change at.
If one must go the route of contraception is preventing human life, then other things must be criminalized such as vasectomies, and masturbation. See, each one of them little seeds is a life that are being killed.