Roc.ror...because he hadn't done anything wrong apparently !
Here is the BBC link. Go straight down to the clip where he is being questioned by the Committee, and you will get a taste of his behaviour.
http://www.bbc.co.uk/news/uk-england-29220535
A major factor in his staying on had the to be the eye-wateringly high salary that he now given up, so it all appears to be about greed and nothing about duty.