On Tuesday afternoon, on the steps of Federal Hall, in Lower Manhattan, where Occupy Wall Street protesters have been contained in recent weeks, Loren Hart, a conservatively dressed man of 33, sat reading a newspaper as he held a sign that gave quiet expression to pervasive grievances: “The economy is failing us. Our climate is worsening every day. Perhaps we should make some serious changes.” Mr. Hart arrived in New York from North Carolina in October to join the Occupy movement with the expectation that he would stay a few days, but he has felt unmotivated to leave.