I don’t understand this one, Carter’s Secret Service detail are operatives presumably loyal to the United States and not personal employees of the former president.
If the Israelis had such powerful objections to Carter (which is understandable) , why didn’t they just deny him a visa and bar his entry.
This is diplomacy being played out before our eyes. This was a snub of royal proportions, a message sent directly to Carter. Had the Israeli’s done what you are suggesting the signals would have gone far beyond just this worthless peanut farmer.