This response is amazingly vehement for how wrong and baseless it is.
So…you're going to search for a single person named Mark in a population of 7 billion?
Nope. Because the article also happens to let us know that the person in question lived in "H█████, Indiana". So now our search is limited to towns that start with "H" in the US state of Indiana. That's not exactly "the biggest fucking haystack ever", as you put it.
Even if we didn't have that, we also know that this person is from the same area as where "Trudy D██████, a local real estate agent who had been reported missing on 07/22/2000" is. Real estate agents don't exactly go missing all the time, and we also have a specific date and we know most of the person's name. Oh, and there's a town council member that we can also identify in this manner. Ten minute Google search.
If you're going to be all aggro and confrontational, with the "don't you dare"s and what have you, you had best come correct.