Don't feed the trolls

As a generalisation, I agree with Andrew Bolt - don't feed the trolls!!  The would dislike being ignored.  There are occasions, however, when people must be made accountable for their actions and I refer to the "Dawson troll".  This person has been cleared by her employer of any wrong doing and has resumed work.  Her job is as a university mentor.  Now, my dictionary describes a mentor as a wise counsellor.  Please explain to me how some-one who tells a vulnerable person to "go hang themselves", can be either wise or a counsellor giving advice to young people???????