I will not bother with links to stories about the tragedy in Boston. I think anyone reading this knows about what happened there. They might not know that bombs still go off in Iraq and Afghanistan constantly. In those countries weddings, funerals and religious celebrations are popular targets. Now in the U.S. it is one of the most famous sports events in the world. I often see comments, whether in fiction or non-fiction that we are all capable of violence, that we don't know what we are capable of until we are tested in some way. But I do know that these people murder, maim and destroy with no true threat to them or theirs and no regard for who might be killed and that makes them as alien to me as any being imagined by the best science fiction writers I know.