Then you are familiar with the data that stipulate that children whom are abused by someone that they know are several fold more likely be victimized by a stranger? (I don't keep those exact data on hand).
It's not an either/or scenario. That's the illogic - if I cannot prevent any harm, then why bother? Or, "they are more likely to be hurt by someone familiar, so why bother trying to protect them from harm from strangers". Makes no sense to me.
(Over)-Protecting children from disappointment or getting their feelings hurt is very different from a reasonable effort to protect them from abuse or assault.
Re: how under-reporting is stipulated: via a number of statistical modeling techniques and strong research designs (not in that order).
BTW, here are some sources that clearly state children are more likely to be sexually abused by someone they know:
1) The National Traumatic Stress Network -
http://nctsn.org/nctsn_assets/pdfs/caring/ChildSexualAbuseFactSheet.pdf
This says around 75% of offenders have a relationship with the child:
"Myth: A child is most likely to be sexually abused by a stranger.
Fact: Children are most often sexually abused by someone they know and trust. Approximately three quarters of reported cases of child sexual abuse are committed by family members or other individuals who are considered part of the victim’s “circle of trust.”"
2) The American Psychological Association -
http://www.apa.org/pi/families/resources/child-sexual-abuse.aspx
This breaks down the offender categories nicely:
"Most children are abused by someone they know and trust.
* An estimated 60% of perpetrators of sexual abuse are known to the child but are not family members, e.g., family friends, babysitters, childcare providers, neighbors.
* About 30% of perpetrators are family members, e.g., fathers, brothers, uncles, cousins.
* Just 10% of perpetrators are strangers to the child."
3) The Department of Justice National Sex Offender Public Website -
http://www.nsopw.gov/en/Education/CommonQuestions?AspxAutoDetectCookieSupport=1
This is the highest percentage:
"This question/answer states up to 93% of cases involve an offender the child knows.The people who sexually abuse can be immediate or extended family members (fathers, mothers, stepparents, grandparents, siblings, uncles, aunts, cousins, etc.). They can be neighbors, babysitters, religious leaders, teachers, coaches, or anyone else who has close contact with children.
Fact: In as many as 93 percent of child sexual abuse cases, the child knows the person that commits the abuse.4"
"References:
4. Douglas, Emily, and D. Finkelhor, Childhood Sexual Abuse Fact Sheet. Crimes Against Children Research Center, May 2005. (
http://www.unh.edu/ccrc/factsheet/pdf/childhoodSexualAbuseFactSheet.pdf) (November 1, 2012)"