The Syrians and Arab townspeople defended the former dynasty of the Omaivd caliphs. The Arabs living in the desert (Bedouins) supported the new dynasty of the Caliphs of the Alids (Fatimids), but to no avail: their economy could not stand the competition with Syria and Iran. The Persians and other eastern peoples of the caliphate supported the dynasty of the Abbasid caliphs and won.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.