Rush was talking about this earlier this week. Apparently, they intend to flag the garbage can of offenders so as to publicly shame them. As much as they would hate the comparison, liberals are the intellectual offspring of rigid puritanicalism. They've tossed out any pretense toward serving God, obviously, but they've created new ersatz gods in the form of "the Earth," "social justice," "equality," and so on. They are otherwise very much like those puritans of the past, eager to hunt down witches, eager to brand violators.
I find it amusing that liberals look at stories like the Scarlet Letter and immediately look for comparisons with conservatism, when far closer comparisons can be found in a mirror. They're liberals though, so they have no capacity for cognitive dissonance. It's all about what serves their ambitions right here, right now, in this particular instance.