In a weird way I hope I get an email like this at some point. My reply will be a point by point rebuttal/refutation.
I was never actively serving god. Perhaps no one in the congregation hurt me, but it was the systematic lies, deception and control of the governing body that caused me to leave. Assuming you believe their claims to speak directly for god, then yes it was Jehovah that offended me. Yes my life is happier and more meaningful since leaving. My dedication was the result of fraud, so I view it as null and void so there's nothing for me to live up to. When will his day come? It's been "soon" for over 100 years and every prediction (1914, 1925, 1940s, 1975, 2000, within a generation of 1914) for when it will come has failed. Why should I return to the organization that defrauded me for safety they don't provide from an event that only they claim is coming?
Maybe that's a little much but whatever. If they want to make assumptions about why someone's not in their cult anymore, they should be prepared to have those assumptions challenged. Obviously, though, this approach really only works if you're willing to let the cards fall where they may and get DFed.