They are abhorrent and inflammatory cases but, the abduction, rape, and killing of children by strangers is very, very rare based on any source of statistics available. However, such incidents receive a lot of media coverage, leading the public to overestimate how common these cases are leading to laws such as this one.
The vast majority of sexually abused children are not victims of convicted sex offenders nor Internet pornographers, or whatever is the media story du jour and the percentage of sex offenders who re-offend once released is minimal. It's a myth propagated by sensationalist media crusaders and internet bulletin boards.
One tragic result of these myths is that the panic over sex offenders distracts the public from a far greater threat to children: parental abuse and neglect. The vast majority of crimes against children (90%) are committed not by released sex offenders, but instead by the victim's own family, church clergy, and family friends.
According to the National Center for Missing and Exploited Children, "based on what we know about those who harm children, the danger to children is far greater from someone they or their family knows than from a stranger."
If lawmakers and the public, including those "venting on the internet" were serious about wanting to protect children, they wouldn't be misled by "stranger danger" myths and instead focus their time and energy on the much larger threat ... inside the home.