Poison from the Pulpit

Often times, what keeps people listening to False Teachers and Pimp Preachers is that the majority of what they preach IS helpful.  Much of what the say is scripturally sound.  However, they slip in a false teaching, or a manipulative command or a passive-aggressive reprimand...and the entire message becomes tainted.  Just like having a pinch of arsenic in your meal...it won't KILL you, but it will make you sick and keep you weak. How do Pimp Preachers and False Teachers slip a little bit of arsenic into your Word?