There is sufficient data to provide quantitative answers to these issues. And actually solve the problems. Unfortunately, various groups ranging from well intentioned and well informed, to well intentioned but misinformed, to mal-intentioned and well informed, to mal-intentioned and misinformed, and everything in between are continually arguing passed each other. Some are trying to solve the problems and know how. Some are trying to confuse the issue to keep dysfunctional systems in place because they are so lucrative. And so there is not much more to say about it.
От Луки 6
43 Нет доброго дерева, которое приносило бы худой плод; и нет худого дерева, которое приносило бы плод добрый,
44 ибо всякое дерево познаётся по плоду своему, потому что не собирают смокв с терновника и не снимают винограда с кустарника.