I agree. There was a petition to create a law, or change the law, so that a child under 13 would be automatically listed as missing and endangered even if they are runaway. It was named Gannons law, and was circulating in February 2020.
As far as I know they got the required signatures. But I haven't seen any more information about the status of the petition and whether the state legislature has any plans to honour it.
As I recall, that initiative didn't go anywhere because it was impractical to require LE to immediately treat every missing child under a certain age as a potential murder or kidnapping victim. (And fortunately the vast majority are not.)
It's already possible in most states to classify missing younger children as "endangered" based on age. But codifying by law police procedures for missing children into a one-size-for-all will cause foreseeable problems. And it's not clear it will actually help. In cases where the child has been abducted/murdered, especially when that's been done by family, unfortunately it's often too late to save the child's life by the time LE becomes involved (as it would have been here.) And children are much more likely to be killed by caretakers than by strangers.
And as I recall, part of that initiative (or perhaps another done at the same time) was to require Amber Alerts for all runaways under a certain age. That would completely change the current purpose of those alerts. So far as I know, an Amber Alert can be issued only when there is reasonable belief an abduction has occurred AND there is information about the abductor, the vehicle, the time/place of the abduction...or something. It's not just a "be on the look out for a child" alert right now.
But as the use of Amber Alerts has increased, lots of people have turned off Amber Alerts on their cell phones. (I have.) Otherwise I receive fairly frequent alerts about abductions (almost always involving a non-custodial parent) occurring hundreds of miles away. And certainly during the pandemic unless the abductor pulls into my driveway I'm unlikely to see him/her. Receiving constant alerts about the thousands of younger kids who are reported to have run away each year will cause even more people to ignore the alerts entirely.
This is a heart-breaking case. And it's natural for people to want to do something when heart-breaking cases occur. And sometimes what's done makes sense. There have been many "victim laws" enacted including the Amber Alert law. But not all knee-jerk reactions make sense. Creating laws that tie up LE and increase the number of emergency alerts issued won't keep kids safer, IMO. The key to increased safety lies in the hands of those closest to kids. And I'm talking about adults being responsible, not siblings or step-sibs like 17-year old HH. (The issue of whether HH helped cover up the crime is a different issue. But an awfully lot of people seem to think she should have protected GS, a position I can't endorse.)
JMO