I think people are looking at a few different statistics, and observations.
The last published statistics have the number of stranger abductions in the US as low as 2%. So even if you double,triple, or multiply it tenfold, your child is much more likely to be abducted by someone known to them (or you)
The percentage for molestation is higher, at 15%. But again, much more likely to be someone who has some sort of relationship with your child, if only the bagger at your supermarket.
Then, people have observed that guests at WDW seem to hold them to a higher standard of safety than at your local mall, for example, and are more likely to sue - which makes the news. However, it probably wouldn't make the news if the child was abducted or molested at WDW by a relative or someone else known to the family - it happens. Just as it often isn't reported to authorities in the "real" world, it isn't at WDW.
I suppose there might be ongoing investigations where families are asked to keep quiet by the police in an attempt to capture someone. But I would think that could open the door for lawsuits if another child was put in danger because parents weren't warned that a predator was on property if they found out after the fact? :shrug:
Even though I agree that it is never wise to let your guard down when it comes to your children, statistically, when it comes to abduction and molestation, WDW is safer from predators than your own neighborhood. I know that it is 100 % true in my case - I check the offenders registry online!

And those are only the people who have been caught.
WDW is not completely safe, but safer. Which wouldn't make you feel one bit better if your child was in that small percentage - so be careful.