The unspoken assumption behind this is that atheists aren't human. Though, having said all that, their findings do disprove this obvious nonsense. I think perhaps we would have noticed if half of our population were psychopaths.
In England, yes. But in the good ol' US of A we already know more than half our population are psychopaths. Christian psychopaths. It's part of our culture.
Here atheists are not treated as aliens, non-human. We are treated as heretics. Traitors to their god. Lost souls controlled by demons walking in their sacred midst.
BTW. Did you really expect anything different from the Vatican?
Eschew obfuscation. Habituate elucidation.