They are people just like any others. Some are good, some are bad. I believe most therapists get in to their positions for the right intention of helping people, but some, somewhere along the way, start being influenced in ways or take on habits to the point that they no longer help and can actually harm their patients...but that's not unlike any other profession. Most people do not go in to their professions to mistreat others, be con artists, or to steal from others...the list goes on, but that doesn't mean some of them aren't subverted somewhere along the way and become that way.