When someone loses a fetus to a preventable accident, trust me, we will start getting lawsuits in which such a tragedy will be considered either voluntary or involuntary manslaughter as a result.
Without this law, it has been more recently possible to hold others accountable to violence to women carrying a fetus.
This greatly expands the scope of that.
http://en.wikipedia.org/wiki/Involuntary_manslaughter
The term miscarriage implies that the fetus died of natural causes.