Yes, I have thought about the JW types you have described. I have also known folks in both categories personally. As noted by others, people who were living a destructive train wreck of a life bettered their situation by embracing a high control cult or by becoming BACs, etc. Whatever works.
As far as not upsetting the applecart of long time JWs who are getting up in years and have lives completely saturated with the org. This is a situation soaked with irony. What about the people they converted or are trying to convert as we speak. Do they think that it would be unkind to convince a lifelong Catholic or Baptist, etc. to abandon their family faith?
I say that those who claim the truth is so all important should be able to handle it. I'm not too sympathetic towards people who are out knocking on doors for the purpose of shredding other peoples lives and beliefs.