“I am doing this — after being on Facebook for nearly 12 years — because my own values and the policies and actions of Facebook have diverged to the point where I’m no longer comfortable here,” he wrote on Facebook.
If he had a better way of reaching his audience, why not use that instead?
If some subset of your friends/connections are only reachable by Facebook, they are the ones you are going to disconnect with by doing this. Makes sense to me.
It clearly isn't here, so his post would have made more sense outside of Facebook.
Especially if an important part of that message is to disseminate a forwarding address.
I must admit to also having read the comment as being in the spirit of Mister Gotcha, cited by bluboo below: https://news.ycombinator.com/item?id=18708394