It's their genetics. Persians in general are amongst the most hairiest people in the world.
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The Greek set a trap so that they could surround the Persians.
The Persians did turn on the Babylonians because they wanted to enlarge their territories.
The Persians believed that trade forced people to lie, cheat, and be greedy
Persians
They formed an alliance because they wanted to rebel against the Persians. Athens had all the brains and Sparta had all the war like abilities. Athens needed someone that was good in war. Even though Athens had a strong army it was still too small to over ride the Persian Empire. The Persians were a common enemy for Athens and Sparta. They both had something in common; liking the Persians. So the more people Athens had in their army the more likely it is for Athens to win. In the end Athens does win the war against the Persians but there are many more wars the Athenians and the Persians have had against each other.