VFDs typically call together an "incident stress debriefing" after grisly tragedies. The most memorable day in my brief career as a volunteer fire fighter featured three structure fires in a department that usually got one a month. The middle fire involved kerosene space heaters in a trailor and three dead kids. I go there in time to see 'em shifting a tiny skeleton from the ashes -- turned out to be the family dog. I then spent an hour fending off the dogs and media camera men drawn by the scent of human tragedy. I had some really vivid nightmares over the next few weeks.
My girlfriends dad worked with a small VFD in a town on US-12 in Michigan. US-12 is a very busy two lane highway across the state. They dealt with a lot of really bad truck/car accidents.