Guilty Plea in Pitcarin Trial

Dennis Christian, a defendant in the Pitcairn Island sex abuse trials, has changed his plea from innocent to guilty. While commendable in and of itself, the decision knocks a huge hole in the arguments of some Pitcairn Islanders and their apologists that what went on was perfectly natural. If they had really believed that then why did they convict Ricky Quinn for such offences in 1999?