Effective leaders are firm-handed. They dispense favours to obtain loyalty and give incentive - but those who do not deliver suffer the consequences. So - healthy scepticism and mistrust are important ingredients behind the benign, pleasant welcoming face they present. At the end of the day - they have to watch their backs. Saintliness and pure honesty requires trust and placing oneself completely in the hands of the other person - believing that they will not exploit your position.
Public consistency is vital to maintain a virtuous reputation as a fair, honest, trustworthy person.
Exposure as a dishonest, double dealer can be personally damaging. The manager will be a member of many constituencies - each having their own expectations. The script and the expectations of different audiences have to be understood. Leadership theory and managment development tend not to explore the reality of this rough and tumble.