The most difficult things to reform are the personal qualities of those in or near to positions of power, whether that power is political, financial, religious or royal. The perks of the job can be too tempting for some (cash for influential preference, contracts for friends, presidential pardons for dodgy supporters, trusted access to altar boys,increased opportunities to indulge a questionable or unsavoury lifestyle.)
If we could crack that, we could be sure of integrity and humanity in ALL public life. Then we could stucture the institutions as we wished, knowing that no-one would misuse their position in them.