Don't you agree? The doctrine part has its appeal for some people, but most join and stay because it feels good to belong to something larger than yourself.
Realizing this may make it easier for some to stay away. That longing you may feel at first to join them or go back to them is not holy spirit, it's just the natural human inclination to belong to a group.
To anyone thinking of merging with the JWs, here's a tip: Find a group that let's you be yourself, a group that appreciates and makes use of your individuality.