Recent events suggests that a Pangrammatical reminder might be in order. Culture is to manners what nature is to causes. Don't look for the cause of an event in your culture. If there is a cause (something that could have prevented "it" from happening), it will be found in nature. Do, of course, compose yourself in the face of events in a suitable manner. Be polite or impolite, politic or impolitic, as circumstances require.