There is nothing in the Bible that really says we will live in a paradise earth forever. Jesus only spoke about living forever in heaven. The witnesses have created a false hope of a material paradise with fleshly immortality rather than a spiritual one.
I think this so appeals to people, myself included at one time, because we are afraid of death and the unknown. Telling us we will never have to die soothes that fear, but it does not make it real.
I think the society is very aware that this teaching is false, but doesn't want to bust the bubble so many have caught up in.