All else equal, good economic policies should encourage and support stable families and promote civic engagement. And to help people feel in control of their own destinies, policies should respect the autonomy of individuals, families, and communities to make their own decisions whenever possible, as research has confirmed the intuitive notion that individual freedoms contribute to life satisfaction.
Notwithstanding that income contributes to well-being, the economics of happiness is also a useful antidote to the tendency of economists to focus exclusively on material determinants of social welfare, such as the GDP. GDP is not itself the final objective of policy, just as an increase in income may not be a good enough reason for you to change jobs.