I pondered your question for years after escaping the tower. I bought litterature and self help books. There was no internet in 81.
Different people are wired different ways. They are working different angles.
Myself it took me about 23 years of reading the bible and studying it after escaping the tower to conclude that the bible is the deck of cards the wac tower society is built on. I wanted the bible and its god to be real.
Today I would like God to be real. Not the god of the bible. I realize that is my bias and because of it, I discount pro evolution arguments.
One book I read in the 80's said we are all like zombies walking around in a trance. Some of us have more awareness than others.
When I was studying the bible, I was doing so because I wanted it to be found true and real. So I was in denial and deluding myself and not thinking rationaly because I wanted to see what I wanted to see, The bible being the word of God.
As far as I can tell life has no meaning or purpose but what we give it. To some being a witness is their meaning and purpose and they do not find it as detrimental and hindering as I found it.
And If being a witness is their meaning and purpose they do not realize that life has no meaning and purpose, which can be a cold hard reality.