You were right to stress "Every belief." The problem is that the system does not challenge leftist beliefs, only conservative ones.
So far you have not shown that.
The prof who asked students to prove that Bush is a war criminal should have, instead, asked students to take a stand for or against that position.
Nonsense. The goal was not to give their opinion but to see how well they could support a position. The professor was absolutely right. And once again, you assert he would have marked down a student who disagreed with him but you provide no evidence.
Aslan is not a Tame Lion