Wrong to Enforce a Right?

Kenny Pearce follows up on my Abortion Exceptions post with some exploration of how a libertarian can tackle the same issues. One thing he suggests that really attracts me is the idea that it's morally wrong to pursue some things that we have a right to. That may be the best way I've seen so far to capture theoretically what's going on in some of Jesus' statements in the Sermon on the Mount that are so offensive to many people. It will probably take some time for me to think about this before I say any more, but I thought I'd put it out there to see what people think of it as a way to capture what's going on behind those particular ethical teachings.