What people don’t remember about the Peloponnesian War because “Democracy”, Athenians were corrupt, aggressive, and treated their vassals and allies badly. They caused the Persian War and had to beg Sparta to bail them out. At the outset of the Peloponnesian War they were engaged in a program of overseas expansion, plundering neighboring City/States to finance it.
In many respects the Spartans were a noble band of warrior defending the independence of others.
Oh, and they won by the way.