Xshayathiya don't make a generalization, you quoted from Mu'awiyah who actually a racist person and we all know the Umayyads they were cruel against non-Arab but they were more cruel against the houshold of the Prophet(PBUH),bani hashim their cousins so you can't take him as reliable person cause he doesn't represent the real Islam.
Imam Ali (PBUH) treated all people equally with no diffirences and your quote doesnot make sense,the Imam was the caliph and had all the power in his state no need to go to the Arab and ask them,if he saw somthing wrong he would fix it.
"Be not in face of them a voracious animal, counting them as easy prey, for they are of two kinds: either they are brothers in religion or your equals in creation"
from Imam Ali's letter to tje governer of Egypt Malik bin Al-Ashtar.
and I can't see anythingin your second quote except anti0arab propaganda.