Grim just linked to a Vox article on Donald Trump's financial conflicts-of-interest. I didn't read it, but I can easily see how they would be Legion. Yet Grim points out an odd paradox - as conflicts-of-interest increase, they might tend to nullify each other. (Note also how this mirrors foreign policy - helping anyone in the ME inconveniences two other friends. Or international charity - giving food puts local agriculture out of business. Tradeoffs, all is tradeoffs.)
But how like Vox to focus only on money as a possible hidden motive. The entire literature of mankind is taken up with humans who are evil for other reasons, or good men who are tempted and fall for other reasons. Status, power, honor, admiration, security, revenge, romance, adventure, lust - these are the stuff of our myths. Is there a Greek drama focused on money? Does any villain of Shakespeare court damnation because of cash? Even a stereotype like Shylock has other things happening. The Arthurian legends and the Siegfried legends have reference to gold as a motivator, a synechdoche for wealth. And yet these are not merely greed, for the beauty of gold and its timelessness are also in play.
Chaucer makes fun of the greedy, and Moliere not only wrote "The Miser*" but had other such characters, all comic. Dickens had evil/humorous moneygrubbers. Does anyone think Darth Vader could be bought?
Is there a tragedy in literature built around simple greed? The apostles tried to pin that on Judas, but closer examination makes him more complex. There must be one, but I am not thinking of any. Speaking of the Biblical testimony, BTW, the insistence that the love of money is the root of all evil is one reason I am not quite a literalist. Expositors try to find ways to make that so, but it just isn't. Paul is making a poor generalisation here, as the love of money is not the only temptation. (See Commandments, Ten.)
I invite readers to think through their own reading. Isn't this focus on the greedy as the main villains much more common in the modern era?
*Anecdote: William and Mary performed "The Miser" my freshman year. (As an aside, Glennie Wade, now Glenn Close, played Frosine.) The actor playing Harpagon mixed up a line in rehearsal, saying "That man is trying to steal my daughter and seduce my money!" After we all did a double-take and laughed, the director told him to keep it in, assuring him that Moliere would have preferred it had he thought of it.