True, “stupid” is a vague term.

If we go for the idea of knowledge in ancient Greece (that’s where these characters are from), the greeks philosophers though there is no “bad” people, only people who are misinformed. “Good” and “Truth” are one and the same for the Greek philosophy. Someone acting in an evil way is only doing it because they don’t realize that what they are doing has repercussions that ultimately are against their own interests. So in this view, it’s only lack of knowledge what leads to bad decisions.

Something to consider is the people who are actually mentally sick and their brain does not function in a healthy way (eg. psychopathy, masochism, etc)… but again, what this would mean for the greeks is that these people might have trouble seeing truth, it’s not that they are fundamentally “bad” but rather that they have issues that cause trouble acquiring knowledge that would let them see their actions as wrong. They might only be able to see things in the short term, for example, instead of thinking if the action is in their interest long term.

What the ancient greeks would say about accumulating wealth and power being the main guiding principle is that this is a “stupid” thing to do. Socrates and Plato would likely argue that the pursuit of wealth and power should be subordinate to the pursuit of virtue and wisdom and that if you accumulate things without first thinking of the consequences that means you have not acquired enough knowledge to understand the consequences of your actions.