How could we know that?
All we know about them are from what they left behind, buildings, pottery, some writing, landfills, etc, and what that tells us is subject to interpretation by current day historians with their own agendas.
Besides, I am not clear on which actions actually indicate wisdom. For example, we treasure the Gothic cathedrals of Europe; but, was it wise to expend that much money and that many lives to build them? I honestly don't know the answer..