Turner was only sentenced to six months in jail; the leniency of the sentence has led to an effort to recall the judge. Being placed on a list seems like a small punishment in comparison to a prison term. But sex offender registries were never meant to be a punishment—and since they were introduced in the mid-1990s, they have proven to be both ineffective and often unjust.

Given the horrific nature of his actions, and his effort to shift blame, some might argue there’s a risk he could victimize others. Placing him on the sex offender registry, in theory, should warn communities of a potential threat. As one recent pro-registry editorial argued, “the rights of the victims, and the protection thereof, outweigh any perceived infringement of the rights of the criminals.”

The truth, though, is that there’s very little evidence that sex offender registries increase safety in any material way. A 2014 study conducted by Purdue University economics professor Jillian B. Carr of people on the North Carolina sex offender registry found that being on the registry had no effect on recidivism. That’s consistent with a 2007 report by Human Rights Watch, which looked at various studies and concluded that sex offender registries did little to prevent sexual violence.

The registry is also used to restrict residency requirements. Typically sex offenders are prevented from living within a set distance of schools or other places where children gather. Again, there is little evidence that these policies prevent recidivism or protect communities.