Correct, and say what you will about the FBI, they have a pretty good record of finding kidnappers. Not so great a record in safe recovery, but they will find the suspects. If you travel outside the US, you are automatically at risk as a Rich Norte, if you stray from safe zones or guarded, guided groups.
Kidnapping in the US generally falls into 2 broad categories.
Kidnapping of a minor child by an estranged parent, and usually attempting to flee to far distant parts. More property titled as Interference with parental custody, Those, generally, do not involve danger of death or physical harm to the child by the kidnapping parent. a few cases have, but, generally not.
Kidnapping for sexual gratification.
and that falls into 2 categories as well.
Instant gratification, with the death of the victim occurring within a short time frame, hours to a few days. If the, usually, minor child, female, age 5 to 12, is not found within a few hours to perhaps 48 hours, then we figure it is a murder and sexual assault investigation. That's the one that parents of young girls fear the most, if they have even thought about it.
Kidnapping with the willing assistance, or non-resistance, of the "victim".
Tenn. is working one that appears to be along these lines right now. suspect and victim spotted in Oklahoma. she's like 15 and he's 50. I have questions about the resistance of a 15 year old girl, traveling cross country, that she can't get away, or draw attention to herself, if she intends to actively resist.
so, broad sweep, generalizations. not hard and fast, carved in stone.