I was shocked at Dr. Nice's lying, two-faced behavior. Ms. Mentor, being more venerable than the volcanoes, is hardly shocked. Rather, she welcomes you to the real world of politics in academe, where one must often rise above principles. It encourages brutal pronouncements. The pursuit of perfect honesty can encourage sexual harassment.
Tenure does have the power to create villains.
Others dig down and resurrect their truly nasty natures, leaving their colleagues with a dilemma. He can easily, and without provocation or punishment, make everyone else's life a living hell. Post-tenure review is rarely the answer, since it deals with teaching and research. Moreover, good faculty members will flee if the bad ones stay. He bailed out and made himself a splended new career as a best-selling author.