Part of the governments constitutional duty is to provide for the general wellfare. It is no secret that the individual rarely looks out for anyone besides their-self. The government is providing incentive for people to upgrade to better technologies in order to provide for the general welfare by reducing pollution and helping maintain the automakers (who are in trouble). If the automakers were to suddenly close down the US would be plunged into a depression comparable to the great depression (again the general welfare).
The government is trying to make decisions that improve society on the whole that would not be made by the individual because in the end most individuals say "it's not my problem" despite the fact that it is or will be soon.
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