I'm sure most of my readers already know that at least two professing Christian groups in Colorado were targeted by a shooter (perhaps the same guy), resulting the deaths of several people.
I was surprised to learn the detail that did not show up in many of the news articles, but is provided by Vox Populi (link). I'm not familiar with that much of what VP writes, but the point he makes (that it is a good thing that the church had someone there with a gun) is a valid point (and seems to be repeated here).
God uses means to protect the innocent. Don't forget about that.
Update: Here's Carla's very different take on the subject (link).
Further Update: The guard turns out to be a heroine (link).
Yet more: TheoJunkie weighs in on the matter (link) (and in the combox of this post), as has Ben Witherington (link).