The Undertaker represents a source of social anxiety, like economic problems or wars. The bum represents the frowned upon in society (Atheists, Muslims, etc.) The church people are society and the pastor is the government. The gov blames the anxiety on the frowned upon and calls for their persecution, but they all find out too late that it didn't stop the anxiety and it leads to chaos, as even though the bum was killed the Undertaker remained.