It's a little comical to think about the implications of this hypothesis. If the figurines were somehow a "good luck charm" of sorts, with the end goal of yielding a healthy childbirth, would smashing the body of the holder of the child symbolically improve the situation? And if the figures were often sculpted without arms or legs, assuming they weren't hammered off, this doesn't give the "sacred" idol much power. Again, it just displays the female body as passive and easily dominated or manipulated. Their powerlessness is proven not only because they aren't literally magical childbirth charms, but also because they were likely sculpted without limbs. I cannot imagine an idol, if one believed it had consciousness or power or emotion, being very happy without it's limbs.