Is this billboard a legitimate form of pro-life advocacy?

 
A court has ordered the removal of a billboard put up by a man proclaiming, "This would have been a picture of my two-month old baby if the mother had decided not to kill our child!"  Given the man's photo, it was not difficult for town residents to figure out the woman he was talking about.  I'm not a constitutional law expert (though Eugene Volokh is, and he comments on the case here), but just as I'm leery of publicly shaming groups and individuals who contribute money to oppose same-sex marriage, for example, I'm leery of public shaming in this context as well.