Dave Budge quotes, with at least halfhearted approval, this post from Powerline. But the quote strikes me as entirely wrong, for a couple of reasons.
1. It's never too late in the day to decide that killing is a bad idea. It may be too late for one's own redemption (a strict reading of the New Testament suggests it's never too late even for that), but it's certainly never too late for the sake of the world and of those who remain unkilled.
2. The kids shown in the picture presumably did none of the killing. If we are going to stop the killing, then starting with the good intentions of innocent children seems as promising a place as any to begin.