At The Daily Beast a bunch of prominent liberals tell us why they're angry. Put simply their reasons boil down to this: The 50% of Americans who are carrying the other 50% on their backs are unwilling to hand them milkshakes to drink while they're enjoying their ride.
Taxes are too low on the "super rich" (However, even if the super rich were taxed at 100% of their income it wouldn't erase the deficit) and on corporations (our corporate tax rate is the 2nd highest in the world). The poor can't get loans (it was loans to people who couldn't pay them back that led to the collapse of Fannie Mae and Freddie Mac), gas prices are going up (despite vast reserves of petroleum and natural gas accessible to us in our own country), and kids are not getting nutritious food at school (niggardly taxpayers are unwilling to pay for higher quality food for our kids. Of course, there's no reason why their parents couldn't pack their lunches at home.). Moreover, people are not making the connection between storms, floods, and fires to global climate change (could that be because no connection has been empirically demonstrated? Or could it be that if there is a connection we've been told that there's nothing we can do about it anyway?).
None of these people seem concerned about the degradation of the culture, the collapse of the family, the flood of illegal immigration across our borders, the threat to world peace posed by radical Islamists, government policies which make it very difficult for small business to hire and thrive, rising unemployment, the national debt, and a host of other matters far more pressing than school cafeteria food, climate change, and whether the top 1% of American earners should contribute 38% of total tax revenue or whether we should make them contribute 40%.
The fact is that angry liberals are just impatient socialists. Nothing short of government control of our economy in this country will salve their anger and even then I doubt whether they'd be content until the federal government controls not only the economy but every other aspect of our lives as well.