The best passports are French and Russian. Both nations has questionable record on civil rights but Lord forbids any other country to hurt their citizen. That is a sort of medieval sovereign concept. They’d put all the pressure on weaker countries and would hire the best lawyers in the countries they can’t threaten or buy.
It’s one thing when the citizen is grabbed or abused by a foreign power; it’s quite another when (as with the Saudis) a clear crime is committed, one which would obviously be treated harshly at home. Get ‘em counsel, but they ought to face the music.