Dogmatic is “Characterized by an authoritative, arrogant assertion of unproved or unprovable principles.”
The reference this is from refers to a Scientology course supervisor as someone who “will be a stable terminal, point the way to stable data, be certain, but not dogmatic or dictatorial, toward his students.” – LRH
I think this is a fear or earlier association with religion that people sometimes associate reactively with Scientology. They think that someone is going to come in with a commanding voice and carp at them and tell them what they should believe, especially when it comes to esoteric and unprovable principles.
I know from reading my history books that this has happened plenty of times throughout history. Plenty of people have been torched by dogmatic individuals throughout history (i.e. how about the Spanish Inquisition). So, I’m sure most people would have an aversion to something “dogmatic”.
Good that it’s right there in one of the most basic codes of Scientology instruction that a Scientology supervisor is not to be dogmatic, but be a stable person that one can get the right source of Scientology data from.