Any kidnapper will expect you to call the authorities. It was the stupidity of the cops that prevented any possible early hits on the case. They sent a "babysitter" to the Ramseys house not a Columbo!!
No argument from me on LEO eff ups from the very beginning.
I've never thought it was intentional, just general run of the mill incompetence.
I always ascribed the Ramsey's behavior to the realization that their lives had come into the grip of idiots and their family was in very real danger of being railroaded.
FBI:
"... There are only about 35 cases per year of genuine kidnapping for ransom in the United States (most "kidnaps" reported actually regard child custody). ..."
That is for all ages, children to adults.
" ... The consequences are severe; 95% of the kidnappers are apprehended and receive heavy prison sentences. ..."