I think the statistics look different if you look at it in terms of percent of parents instead of percent of children. There's a certain segment that has lots of kids, either out of wedlock or in circumstance especially vulnerable to divorce and vulnerable to conditions which create unintended neglect due to scarcity of resources. Fewer number of kids is also associated with circumstances associated with more privileged background, which skews the statistics to look very different in % parents vs % children.
Also bear in mind some states consider neglect something like "allowed 8 year old to play at park by himself 2 blocks from the house and within line of sight from a trusted neighbor's house" or "left child in locked climate controlled running car while walking inside to pay gasoline because card reader was broken and didn't want to expose child to crackheads/drunks lingering next to the register (if you use inner-city gas stations you know what I mean)."
Also bear in mind some states consider neglect something like "allowed 8 year old to play at park by himself 2 blocks from the house and within line of sight from a trusted neighbor's house" or "left child in locked climate controlled running car while walking inside to pay gasoline because card reader was broken and didn't want to expose child to crackheads/drunks lingering next to the register (if you use inner-city gas stations you know what I mean)."