I have often thought about this and I came to the conclusion that it is because they see themselves as in direct competition with the Catholic Church and view them as enemies but see muslims as potential converts so try to stay on the right side of them. They are also extremely insecure about the Catholic faith because they know it is almost 2,000 years older than the Watchtower cult. Much older than they like to admit. That's my theory anyway.
This is the way they work and that won't change anytime soon.