Regardless of what you term "effectiveness" my main point was that a group of very competent antiterrorists did not seem to believe the .22 was a "peashooter".
Yes, but it didn't happen the way you said. Anyway, what kind of "very competent antiterrorist" would choose a .22 pistol to go up against adversaries armed with AKs and grenades? One unlucky slob got in the way a .22 "pea" and succumbed. The incident doesn't prove the effectiveness of the .22 as a defensive round. Were the Swiss security forces that showed up and ultimately ended the fracas in the El Al incident armed with .22 pistols?