All this program proves is government can't do anything efficiently and a lot of people are taking advantage of it to get new cars. If they'd offered the same program and included trucks with lower mpg, lots of people would have gone that route.
This program is a waste. It's destroying perfectly functional cars to put people back into debt to support the auto industry, oddly enough an industry in which the government has ownership stakes in two of the big players.
Socialism destroys wealth and capital (cars are capital).