In Athen's case I don't think it technically counted as corruption in the "misappropriation" sense as the intended beneficiaries received it. Given the number of votes to "pillage and enslaved their neighbors" it would certainly count morally if not for the fact it was "the norm".

At that point the difference between bandits and city state military was essentially just diplomacy in terms of how their neighbors and survivors would react to somebody putting killing or enslaving them.