You should clarify that these are women who deliberately induce a miscarriage (ie. a home abortion) or whose extraordinarily reckless and dangerous behaviours result in a miscarriage that may or may not have been deliberately induced, but either way are unconscionable and directly responsible for the child's death. You don't do your cause any favours when you present these cases as "miscarriages", knowing full well that many people perceive this as the unfortunate loss of a child by a conscientious and responsible expectant mother.
I don't have a problem with this. If a child - even an unborn one - dies in mysterious circumstances, I would prefer the inconvenience of a fruitless investigation over the prospect of living in a society where we don't even care enough to ever be suspicious.