I'm not sure what methods you talk about (skimmed through the thread, so I'm guessing)
Capitalism, socialism, fascism, communism, totalitarian regimes, free and unrestricted market...
Biopsychosocial model is a perfect path into the Brave New World. 
I agree that it can be misinterpreted by non scientifically trained. But any serious discussion about human needs makes any dystopic scenario impossible. You can read the works of prof Gabor Mate or Robert Maurice Sapolsky, professor of Biological Sciences, and Professor of Neurology and Neurological Sciences and, by courtesy, Neurosurgery, at Stanford University.
I think the discussion of method is secondary to the goal. Do we want to feed everyone? Do we want them to be happy? Do we want them to live longer? Do we want them to be free? These may not be mutually exclusive but certainly are not the same thing. Also, do we have a goal as humanity other than being here until the next impact event? I don't think any of the methods presented are inherently unscientific, they just serve different purposes. I might be wrong though...
As I said, there are degrees and it's a matter of scientific debate. However, we alrady have a starting point, which is not based on human opinion, but on solid scientific facts.
Fact: we all need food and water to survive -> we should provide those for free as a right to life, since it's technically possible.
Fact: research shows that beating and abusing children undermines their psychological development -> we should not employ violence on children.
...and so on. As the research continues, we'll have more and more facts to add to our list, and we'll use the scientific method to achieve those goals.
Peace.
Fact: Overpopulation is a serious risk to all life on earth (because humans, like other animals, are mostly egoistical) and foor + water = more humans
The HUMANE thing to do for the future is reducing population, not increasing it.
But of course, that leads to inhumane things on the short term.
So, to do good you need to do some evil.
And now you have to form an opinion about what you consider good or evil.