I tend to use the word, “so” as one of several convincing words to end questioning. Same with the words, “because” and “then” – transition words that move a concept from consideration to conclusion. I use them as Second Degree of Illumination defense to avoid Third Degree of Illumination inquiry and convince myself of my rightness within my First-Second Degree of Illumination bubble.
I use convincing words to invoke consensus as a defense and to halt further investigation. As a conjunction, the word “so” means, “and for this reason; therefore.” (Google) “Because” as conjunction means, “for the reason that; since.” (Google) “Then” and “therefore” conjunctions essentially mean the same as “so”.