One of the most important aspects of persuasion is social proof. We see other people leaving JWs and this persuades us that there are good reasons for leaving JWs.
That had nothing to do with why I left. I didn't know any ex-JWs.
It was 100% based on facts and evidence. I researched doctrines using only the bible and WT library including many of Russell's and Rutherford's books.
Logical arguments only work with people are are already convinced.
I was entirely convinced the WT was the Truth when I discovered a flaw in the doctrine. It was about facts and nothing else for me. I'm certain I'm not unique.