I wrote this a few years ago in response to a similar piece: The problem is that the rich have the ability to take their income in alot of different ways. Tax income more, they'll take it as dividends. Tax dividends more, they'll take it as capital gains. Tax capital gains, they won't realize their capital gains until they can offset them with realized losses or they'll just get bank loans again't their stock holding…
In a world where food is abundant (for now) that's what keeps everyone else poor. Limit their ability to become greedy landlords and they'll be forced to invest in real businesses and take risks.
This can be started on a local level and enforced easily by only allowing people who live in the homes or community trusts or government to own them.
If some billionaire owns 10 ferraris, has millions in offshore accounts and a super yacht why should anyone else care? It's not taking away from anyone and creates demand for luxuries that wouldn't otherwise exist and create jobs.