Politicians need to seem to be doing SOMETHING, even if it is ill-advised, profligate, and futile, endangers Americans' standard of living and the nation's security. It applies to much of today's policymaking, from mitigation of climate change to the regulation of chemicals and genetic engineering.
Only 15% of new homes utilized solar panels. The California Energy Commission now requires all homes to have them because they're good for the environment and they "save you money." But as you may have guessed, there's more to the decision than that.