[cedilla]

It is unethical. All your accusations of narrow-mindedness, but you can't see the obvious, glaring ethical problems with such a trial.

Not the least because it would be completely infeasible. You may pretend that we can "simply" do a "controlled experiment" but you ignore how impossible it is to tell any sizeable group of people to behave in a certain way and report honestly about it.

"Randomised control trials" are the platonic ideal but in the real world, you can't endanger people for your curiosity, and you will have greatest problems to actually enforce your test protocol. It's more than "tricky". Unless you have access to some spherical people in a vacuum.