While I share your position, I do think they certainly get to *try* to dictate their morality onto others.
I think rape is bad. I don't rape. And I dictate to the best of my capacity that others don't rape.
If one truly believes such things (abortion) are murder in the full morally repugnant sense, then certainly they can try to dictate that folks don't murder just as you or I can dictate that others don't rape or murder or steal.
They require a moral consensus in order to so dictate, and I believe they lack such a consensus:
http://www.gallup.com/poll/1576/abortion.aspx
Part of this clear lack of consensus is the willingness for folks to allow it under various circumstances. I'm not sure attitudes about murder (sans "war") or rape are so plastic.
But the circumstance is, in the end, one where 46% believe that god created humans in their current form within the last 10,000 years.
http://www.gallup.com/poll/155003/Hold-Creationist-View-Human-Origins.aspx
A very common view is one of a very young earth, only very recently inhabited by humans. Such notions may not lend themselves well to a mind your own business mentality. Similarly the onslaught of evidence to the contrary could perhaps easily lend one towards a mindset of heathens everywhere all out trying to get you. I can't imagine holding such a view and not being profoundly paranoid and deeply suspicious of pretty much anybody that did come out of my cookie cutter.
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