I thought this was interesting..

Moral reform is a frustrating and ultimately impossible task.Moralism aims at an unattainable goal: the improvement of society without any transformation of people's souls. The leopard cannot change his spots. Sinners cannot reform themselves. And therefore society as a whole cannot be truly reformed unless people are made new creatures in Christ (2 Corinthians 5:17).

MacArthur, J. (2002). Can God bless America? : The Biblical pathway to blessing (87). Nashville: W Pub. Group.