It's art. To which culture do you refer?
"But the premise of this show - that the ancient Persians were not tyrants - rests most firmly on the Cyrus Cylinder. A stone cylinder covered with cuneiform writing, it describes Cyrus's conquest of Babylon in 539 B.C. and his order that all religious cults be tolerated and that deported peoples be freed. According to the Book of Ezra, this included the captive Jews in Babylon who were allowed to return to Jerusalem."
Bully for Cyrus, who died close to 200 years before Alexander came along.
The Persian Empire was utterly decadent by Alexander's time, as can be seen by their complete inability to deal militarily with the Macedonians or even the squabbling Greek city states before them. It was in the process of falling apart in wars over the succession in the same way just about every oriental empire before or since has. Doesn't mean they couldn't produce great art.
This is most famously seen in the march of the 10,000 as told by Xenophon. Any country that allows an enemy army, after losing all its leaders, to fight its way out from the center of its empire isn't in very good shape.