He's not and we don't really know why.
All we know is that he's got a pretty full plate these days and the public (and appearantly along w/ a pretty big chucnk of the FR) really hates banks more than they hate Marxists. My personal guess is that he's playing along with the 'bash-the-rich' crowd to get elected and that he'll wind down as voters go back to sleep.
My concern is that the cause of America's ills is not which partisan faction controls, but rather the business-bashing that puts 'em in office. I'd dearly love to see the public sober up and put aside this class warfare schtick once and for all.
I’d wager that 1. Banking stuff is hard to understand in the first place unlike illegal immigration or crime issues, 2. Many of the marginal Democrat voters he’s trying to attract are too stupid to understand something that complicated, 3. If he can’t build a wall and keep the economy from imploding stuff like this will rapidly become academic.