The problem is a huge number of cars were removed and destroyed which would otherwise have been in the used market. It's a big reason why even used cars are priced so high. Buying used isn't what it used to be.
https://en.wikipedia.org/wiki/Car_Allowance_Rebate_System
And they want to do it again not because it helped anyone get a car but because it let them make the prices so stupidly high.
I agree that new cars suck but they're removing the stocks of used cars that would be worth buying at any price and at our expense.