I think that earned income should not be taxed at a higher rate than unearned income. I think that unearned wealth transfers should be taxed at a higher rate than earned income. I'm in favour of a broadening of the tax base away from labour and onto wealth and things like local services taxes. As technology reduces the amount of labour required in the "capital + labour = wealth creation" equation we are seeing a concentration of wealth away from labour. That's not good for society.I suspect a LOT of people who think it's better to tax unearned income are the same people who think a flat income tax, which arguably encourages work and especially overtime the most is grossly unfair, because they don't make 400k a year.
In that context I am in favour of a flatter, or less progressive, income tax model. The current system is massively beneficial to me but that's not a good reason to support it.