There's a lot of arguments here based on emotions and assumptions rather than logic.
I don't think any person is simply "good" or "bad". A person can perform a "good" deed one moment, and a "bad" deed the next. When people look at someone and judge if they are a "good" or "bad" person, they are usually either: 1) judging that person by the overall sum of their publicly known deeds, or 2) judging that person by deeds they have performed for (or against) the judger.
Being in possession of great wealth is not a deed. A person can come in possession of great wealth relative to other people in a society without taking any action (e.g. inheritance, etc) or without taking any evil action (e.g. winning the lottery, taking profit from a sufficiently large business that doesn't perform any ethical violations, etc).
Too tired to read logical arguments? Comfortable in your assumption that all rich people are bad people, based on your distaste for the few famous rich people who are constantly in the news? The vast majority of the world's billionaires prefer to stay anonymous.
Not that I'm pointing out any specific rich people as good people, I'm just pointing out the illogic of automatically linking a person's moral qualities with their wealth without knowing anything else about them. Would you assume the contrapositive, that all poor people are good people?