Syrians were no kharijis or satans either. They were under propaganda of Muawiyah and his cohorts like Amr bin Aas.
But you are free to believe whatever you like.
Sure, Mukhtar was no political threat at that time. But the very fact that Yazid was guilty of killing Prophet’s family was enough to ensure that SOMEONE or SOME PEOPLE will cause harm to the monarchy of the family of Abu Sufiyan.
It eventually showed in the form of Mukhtar al-Thaqafi.