They typically do not abuse their own children -- too valuable as cover.
Absolutely untrue. Roughly 90% of child abuse cases involve a parent or close relative. In fact, it is this exact stat, that has so many people outraged at the sex offender registry. Since so few sex offenders ever reoffend (3.5-5% according to the department of justice, with nearly 50% being the average for all other crimes) that means that these people who abuse their kids don't abuse anyone else's kids so are no threat to them yet they have to register publicly, sometimes for life. They could have just killed the child and been done with it. No law should encourage an act of murder to avoid jail time. If you want to think about the victim, think about what the perp knows is on the other side for him. Make it too tough, and he'll just kill the child. A dead child won't talk. Think about it.
It's a bad bad thing, no doubt, but lets face it, just like you can't lock up someone for being gay, you can't lock them up for simply being a pedophile. It is better to let him learn to control his urges in a way that doesn't harm kids, rather than tell him "no" all the time and then he lashes out and destroys a life.
However, I would like to finish with the fact that not all sex offenders are pedophiles, even child rapists don't always qualify, simply because many molestations and rapes aren't about sex at all. They are about power and manipulation. There have been many sex offenders in prison for molesting and raping children who tested negative for sexual attraction to kids (which is, of course, the requirement to be a true pedophile, no crime alone can create that label). Of course, a lot of this comes from the large number of false accusations that are made against men by pissed off ex wives, ex girlfriends, etc. Who are the cops going to believe, little Emily who says daddy touched her (and was told to say this by mommy, why promised her her favorite doll if she did), or Daddy, the big evil man with a mustache who says he didn't?
See how easy it is?
Ok, sorry I'll get off my soapbox. I just had to correct the incorrect piece of information I saw.
Interesting link:
http://recidivism.samcaldwell.net/
Avg. Recidivism (1983-2010) (all felony offenders):41.56%
Avg Recidivism (1983-2010) (sex offenders, new sex offense): 8.47%