Jennifer Jacquet contemplates them:
[U]ltimately shame is not enough to catalyze major social change. Slavery did not end because abolitionists shamed slave owners into freeing their slaves. Child labor did not stop because factories were shamed into forbidding children to work. Destruction of the ozone layer did not slow because industries were ashamed to manufacture products that contained chlorofl uorocarbons. This is why punishment remains imperative. Even if shaming were enough to bring the behavior of most people into line, governments need a system of punishment to protect the group from the least cooperative players.
The Dish 