When a person (most usually an ex or an anon) says to a scientologist something like "You are still mindfucked, give it a few yeras, and you will unravel", it does come across as arrogant. And it will, as Axiom says drive the person into a defensive position. It does not help him unravel.
I don't know if this will seem to contradict my last post, or fully align with it,
but there is the point that being too polite could mean that a person never feels any challenge to their comfort zone.
Some of the changes that people go through in the ex sci-cult environment (even on the internet), come about because of the pressure applied by the uncomfortable opinions of others IMO. The cognitive dissonance effect forces some re-evaluation that would not otherwise happen.