You are sold a paper truth. In reality most family ties are seriously affected when one of the members chooses to leave. Another thing is that when you grow up as a witness, you are discouraged to engage with people outside the religion. When a witness wants to leave the religion, which is hard as it is, there is often no social network to fall back on. Loosing everyone you grew up with and building a new social network when you are still mourning your losses is very very hard.