and how do you propose to enforce that requirement short of surveying 7 billion people?
It seems you, and others, don't understand what I said.
My criterion is -
The only explanation or theory worth pursuing is one according to which everyone is eventually happy.
Let's take feudalism or capitalism, for example: these are theories according to which a large percentage of the population is miserable:
For capitalism to work, a certain percentage of the able workforce must be unemployed, or the capitalist approach to business doesn't work, doesn't pay off.
For feudalism to work, a certain percentage of the population must live in very meagre conditions, or feudalism doesn't work.
According to feudalism or capitalism, it is not even theoretically possible that everyone would be happy, ever, as these two systems rely on some people exploiting others.
A good theory is one where this doesn't happen. In a good theory, everyone has the chance for true happiness, at least eventually.
In capitalism, the happiness of some people comes at the cost of misery for others.
In a good theory, nobody's happiness relies on diminishing the happiness of others.
An example of such a good theory is Buddhism. Buddhism explains things in such a way that everyone has, at least theoretically, the chance for true happiness.
I can certainly see something is wrong with that interpretation and worldview. But I also know that my feelings can't and don't falsify a theory. It seems like you are projecting an internal conflict and struggle onto the scientific method.
It's not simply about feelings, or simply about rejecting a theory because it doesn't make one feel good.
A good worldview or theory or philosophy of life is one which at least theoretically foresees the possibility of a happy life for all people, and not just for some, and gives specific explanations and instructions on how to act so that everyone can be happy.
A repugnant worldview or theory or philosophy of life is one according to which one just has to accept that a percentage of the population is waste.