How much time have you spent amongst the lower 15%? Ever lived in a trailer park? Every lived in the projects? I doubt it. It's not a knock on you. But, it's very easy to live one's life without encountering those with sub-85 IQ. They ain't online, you know. Most wouldn't be able to figure out how to use the Hacker News interface.
You know, the U.S. military won't take someone with an IQ less than 85... they're too dumb to even learn how to clean a rifle.
In any case, no amount of experience or education will enable someone who lacks mental ability to function at a tech job. There are those who will never -- even with months of hands on training -- be able to grasp opening a Word DOC. What do we do with them? It's about 15% of the population.