Mueller appears to be a modern Torquemada. Should every politician be hounded by a nemesis of their own?

In the spirit of "Quis custodiet ipsos custodes" -- politicians should be under constant surveillance and at risk of removal and punishment lest they always behave like angels. Isn't this the new standard in Western countries? In China, I have been told Confucian legal scholars recommended the threat of capital punishment for corrupt administrators.