Makkah in the land of Ibn Sauds had seen many bloodsheds during recent times, 1979 and 1987. Were they alone in the savagery especially of 1987 when Iran was just set free from the shackles of US hegemony? The Shah had been toppled by Khomeini. More so when Iran kept about 40(?)US hostages taken from the embassy for more than a year.
500 pilgrims dead and more than 4,700 injured in the massacre of July 1, 1987 (6 Zulhijjah 1407). Most of the victims were Iranians because they took part during the agreed upon peaceful march of celeberation.
With the masscres against Yemenis, Iranians, and the the Iraqis (Saddam's venture into Kuwait), the Ibn Sauds are on guard against these countries. This explain the neccessity to keep a US base at Riyadh and their palaces there. Things get more complicated with the Wahabbi-Syiah-Sunni sects.