(amazing username.)
You assume that a lady getting an abortion is not committing murder--these folks clearly think she is.
(We don't need to argue about whether it is in fact murder, or whether if it is that the murder is justified or not--just understand that there are people that believe differently, and apparently they're willing to expend police resources on it.)
> We don't need to argue about whether it is in fact murder
That's exactly the problem: we do. Not here, specifically, but if someone's false beliefs have grown to the point that they are hurting others over them, they need to be stopped.