USSEIRAT REFUGEE CAMP, Gaza Strip, Oct. 21 — It is not unusual for Israelis and Palestinians to have opposing versions of reality. But it is unusual for both sides to display the kind of concrete, if conflicting, evidence that they presented today for the violence that convulsed these streets on Monday night. Advertisement The Palestinians here had their grief and their rage, their seven dead and their many wounded. The Israeli Air Force had its videotape. Palestinian witness after Palestinian witness told the same story: An Israeli rocket struck near a car; then, after two, three or perhaps five minutes...