That's the state propaganda. Turkic people in that area are later arrivals, and the Ottoman Turks basically pinned their legitimacy on the religion of the region. Suleiman was "generous" because the state propaganda of the time was "Ottoman Justice".
Consider a hypothetical history with Persian empire not falling to Muslims and Byzantine also enduring. Best buddies forever or likely the same pattern of pull-push on borders and a cultural clusters boundary condition?
Geography is the key here, not people's misunderstanding regarding the meaning of it all.
As if almost anything written about events in history is not propaganda. There is barely any complete truth. English Wikipedia in general just spews same thing western historians words, others do the same to fit their agenda. History is a joke.
Consider a hypothetical history with Persian empire not falling to Muslims and Byzantine also enduring. Best buddies forever or likely the same pattern of pull-push on borders and a cultural clusters boundary condition?
Geography is the key here, not people's misunderstanding regarding the meaning of it all.