You question begs another question.
If the Leftist car buyback was designed to promote the sale of new and better cars, then why wouldn’t a gun buyback have the same effect? Of course, the question can also be reversed.
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I was being totally facetious about a car buy-back. The point is, the problem is not the object but the individual behind that object. If the cops want to stop crime, they should apprehend criminals, not waste time and tax-payer dollars apprehending objects which are easily replaced from another source and in themselves incapable of doing anything.
But of course, WE know the REAL reason for these buy-backs and they have nothing to do with stopping crime and everything to do with demonizing the Second Amendment and hyping the Kulturkampf the leftist NAZIs have undertaken against traditional America.