[for me anyway] it is evident that our nation is in the midst of the final stage of downfall (v28), having heartily welcomed the first two stages (24,26), and now it is only a matter of time til its downfall: for God has given up on it, and turned it over to a reprobate mind, a mind of depravity; and except the masses repent as did Nineveh in the days of Jonah, there is no more to be done.