When is the last time anyone heard of a ship sinking prior to the Concordia? Titanic? That's 100 years. Think about how frequently there are plane crashes. Or better yet, automobile accidents.
The Concordia sinking is a horrible tragedy, as was the Titanic. Any time there is a loss of life, its a terrible thing. But in no way shape or form will this keep me from cruising. Maybe will just take the muster drill a little more seriously.