The ignorance continues, though, because another thing you learn in college is when to walk away from a conversation that is ridiculous. So truly educated people will not engage in an illogical debate. And so, the JW mistakenly believes that their points were irrefutable. It reminds me of the old adage: Never argue with idiots; they will bring you down to their level and then beat you with experience.
A JW elder in my old congregation got into a debate at the door with the Bishop of the local Eastern Orthodox Church. I remember clearly how he brought up point after point, "educating" that pastor about his own religion. The bishop explained several times that the elder was mistaken, but it didn't stop him from droning on and on. Finally, the elder said something to the effect that "we can all agree that the Catholic Church is terribly corrupt" and the bishop just stopped trying and said "you've given me a lot to think about" and closed the door. In the elder's mind, he had gotten through to a religious leader. In that bishop's mind, the elder was so ignorant that he didn't realize that the Eastern Orthodox Church IS Catholic. I heard that story so many times at get-togethers.
They walk away from every conversation feeling as if they "won" the debate, even when they have simply been judged too ignorant to have a reasonable discussion.
NOTE: After I left the JWs, I actually met that Bishop when he came to the college to talk to our class in religious thought. He said he remembered that conversation at the door. He had ended it because he was tired of wasting his own time. He also said that he prayed that the young girl who was so quiet would wake up and find God someday.