1) Power feels awesome. You'll use your power to get more power because it feels so good to see those you hate having to bow to you.

2) Educated people are dangerous as they will almost certainly doubt the legitimacy of your rule and more importantly have the ability to plot against you. Hence they must go.

I applaud your thinking, as it is empathic towards your hypothetical subjects :) However people like Erodogan do not think at such a level. Assume a primitive (but not dumb) egocentric world view in dictators. If they had empathy, they wouldn't have been able to fight to get to where they are now.