Gee, I tend to generalise a great deal when it comes to the Bad Guys.
But then the Good Guys are not always good either.
One of the reasons the Easterlings worshipped Sauron is because of the Nine Rings: He gave the rings to the most powerful amongst Men, be the Numenoreans or Easterling. I believe that in the UT or some other works, one of the Nazgul is an Easterling called Khamuz or something.
If Sauron gave one of the rings to an Easterling King, he is likely to exert complete control over the people, not that he needed the ring to deceive them any how though.