Vanitas Still Life with a Skull, a Book and Roses, c.1630, from the collection of Nationalmuseum Stockholm. | Fine Art Images/Heritage Images/Getty Images Americans want to soak the rich. But few have strong opinions about precisely how.  Indeed, even among our nation’s most impassioned class warriors, contemplating the fine details of tax policy is an eccentric pastime. In an interview earlier this month, Democratic Socialists of America co-chair Megan Romer called for taxing “the hell out of” the wealthy. When asked exactly what that meant, Romer conceded that she had no “solid answ...