You're right. I was wrong. According to the Center for Missing and Exploited Children 115 not 125 typical stranger abduction happened. From their website -
The most recent, comprehensive national study for the number of missing children estimated in 1999: [1]
Approximately 800,000 children younger than 18 were reported missing.
More than 200,000 children were abducted by family members.
More than 58,000 children were abducted by nonfamily members. (eta these are the friends, teachers coaches etc)
An estimated 115 children were the victims of stereotypical kidnapping. These stereotypical kidnappings involved someone the child did not know or was an acquaintance. The child was held overnight, transported 50 miles or more, killed, ransomed or held with the intent to keep the child permanently.
http://www.missingkids.com/KeyFacts
As for sexual abuse, this is from victims of crime. org.
Only 14% of children who suffered sexual abuse were violated
by an unknown perpetrator (page 172).
60% of children are sexually abused by someone in their social circle. Hence, the phrase Stranger Danger is misleading (page 172).
As for your cases of stranger abuse - The first two never went anywhere. There wasn't enough evidence that a crime occurred and charges were dismissed.
WDW is still pretty much the safest place on earth. Please show me an area that has as many visitors and is as populated as WDW with a rate of violent crime (discounting for squirrel theft) as low.
Back to the original issue, a 17 year old boy is more than capable of navigating the wilds of disney world. The younger child should be capable of navigating as well. If your children hit their teen years and don't know how to handle an emergency or getting lost I would have serious concerns about them as adults. My four year olds know what to do in case they get lost. My job as a parent is to teach them how to be independent and mature adults.