Dr. Barry wrote something about this a few years ago. If I remember correctly, his opinion was that it was proper for a LCMS Minister or laymember to participate in a prayer service (or similar) for the community in times of community tragedy, etc. to show our support for the community & pray for our fellow citizens. I think that he said there were certain ways that this should be approached, however, and I dont think Benke followed these guidelines.
Do you have access to this document? I thought I had a copy but I can't find it.