I respectfully but strenuously disagree. LOTS of people read these threads, read the arguments on all sides, then come away with a broader perspective than before.
Some of these people just don't have much in the way of real knowledge about the situation in the Middle East in general, or of the Western Power's deep and long standing involvement in the creation of the Jewish State.
Therefore we are educating people, as well.
The bigoted schmucks we argue with are perfect foils for us to present the truth. We can't force people to accept truth, but it is our responsibility to present it in the best way we know how.