You can do a lot, as long as you don't harm anyone else - because other people are also free. And yes, you make mistakes. Movies are movies. Same when scientologist Priscilla Presley does electroshocks on TV with equipment of 1950. The scientology front group CCHR has never been able to prove such allegations.
Truth is that one of the main bad guys is a psych.
Every situation in which one person has power over another gives a possibility of abuse. You will find abuse in nursing homes, in the military, in schools, at the workplace - and it is a known problem, that is cared about and discussed. Ask yourself when an abuse in scientology was discussed, and what was done so that it didn't happen again. Even LRH begged for psychiatric help after world war 2. So you have noticed that some methods worked.