Does it Matter?
In truth, Ryu understood Ianjor's perspective. He wasn't a person of weak character, and Ryu knew that he could be ruthless when he had to be, or else he would have never made it to the Omniscient Sky God Realm.
The main issue was in the difference of their upbringing.
In the beginning, Ianjor's Sect was a subordinate of Ryu's. They were treated extremely well under the rule of his father and grandfather, Titus and Saint Tatsuya.
However, after the Tatsuya Clan was destroyed, and Ianjor's Sect followed soon afterward, it was ironically another Tatsuya that made his life a living hell.
Ianjor had experienced two sides of the system Ryu hated so much, he had seen one life where those above you were kind and treated you like humans with real lives and real aspirations, and he had seen the other side where you were treated like nothing more than cattle.