The April 1, 1986 Watchtower contains a statement that has a great deal of impact on the issue of disassociation by actions:
Approved association with Jehovah's Witnesses requires accepting the entire range of the true teachings of the Bible, including those Scriptural beliefs that are unique to Jehovah's Witnesses.
In other words, any JW who does things that are not approved for JWs to practice - celebrating birthdays, holidays, voting, taking blood transfusions, joining an organization whose objective is not in harmony with JW beliefs - has in effect DAd themselves by their actions.
Which is pretty interesting, considering that the WTS itself joined with the UN as a NGO just five years after this directive was published. Did they DA themselves by their actions too??
Love, Scully