These are some statistics from the FBI Crime UCR. Wouldn’t missing children (or even kidnapping in general) be considered a violent crime?
The Uniform Crime Reporting (UCR) Program is a nationwide, cooperative statistical effort of more than 17,000 city, university and college, county, state, tribal, and federal law enforcement agencies voluntarily reporting data on crimes brought to their attention. During 2004, law enforcement agencies active in the UCR Program represented 94.2 percent of the total population.
Crime in the United States
by Volume and Rate per 100,000 Inhabitants, 1985 – 2004
Murder and non-negligent manslaughter
Robbery Robbery rate
Motor vehicle theft