Two problems there: 1. Many people are more likely to go to a lot of effort to complain loudly and widely rather than hit a simple "delete this" link. 2. Such

Two problems there: 1. Many people are more likely to go to a lot of effort to complain loudly and widely rather than hit a simple "delete this" link. 2. Such feature is basically a self-DoS. If someone takes a disliking to the app or a user of it they can script up a "delete everything" and fire it off.