The lower rate indicates an increased appreciation of life. Whether or not you perceive more of a hands-off attitude (I'm not sure where that comes from), the result has been fewer abortions. Now, I suppose there could be entirely different reasons for the reduction in abortions that have nothing to do with appreciation for life. That's probably impossible to measure.
But to the extent that we are speculating the increased mass shootings have something to do with abortion, what little hard evidence we have directly contradicts the notion.