Let me ask this question another way...Do some people actually need to shoot heroin?
Religion is much like a drug. Authoritarian religions are hard drugs. JW is heroin. An heroin addict will need something to help them rehabilitate, (such as methodone), which is still addictive and harmful, just not as deadly. The idea is an addict needs to be weened off the most harmful substance.
Leaving JW is no different for some. Many have no point of reference for how to exist without it. Like the heroin addict who tries to quit cold turkey, (a potentially fatal situation), a JW of this type will not be able to function normally in the outside world. They need something to help them find direction. That does not mean they should keep taking the worst possible poison however. Most other religions are not nearly as harmful, (however untrue they are), and might at least serve the purpose of helping one gain equilibrium.
I am atheist, but I know leaving is a process, not unlike detoxification.
d4g