Staff at the disgraced Oakden aged-care home were manipulative, incompetent and would sabotage any efforts to improve standards in the lead-up to the 2008 murder of resident Graham Rollbusch, an inquest has heard. On Wednesday, State Coroner Mark Johns was told the Oakden facility — which was today slammed by ICAC Commissioner Bruce Lander in a report — had been described by temporary nurses as “a zoo”. Mr Johns is holding an inquest into the death of palliative care patient Mr Rollbusch, 70, who was attacked by dementia sufferer Peter Palmer in early 2008.