To me this is a no brainer:
If a JW in good standing had done to Mr O'Hare what Mr O'Hare had done to the elder, Mr O'Hare would sue. This man is an arch hypocrite - and typifies the organization's own unfortunate stereotypes of disfellowshipped members; sometimes the worst most superifical stereotypes hit the jackpot!
Mr O'Hare is either being deliberately willful or is naive in the extreme to assert he did not think his public actions would cause distress. No kidding?!
Whatever we think about the Witnesses, they are as entitled to provisions of civil law as anybody else. As for the charge that JWs harass other people, for God's sake what special pleading that is! If a JW refuses to leave your doorstep upon your instruction to do so, all you have to do is ask two more times and if s/he still refuses, you have grounds for tresspass. You are as protected as any other citizen against harassment.
There is only one way for Mr O'Hare to go from here on in - and it ain't pretty.