Why do we even have science?
There is a way to get some evidence but that study would never be approved.
Well, that seems like a major problem. There isn't anyone who can do it? Also, studies can be privately funded?
You have experiments to rule out alternatives. They do not ‘prove’ anything. You have statistics to tell the probability that you’ve figured out what is causing something.
Why would an experiment not be approved? Imagine you are expecting a baby. Imagine you are offered the opportunity to take part in an experiment in which half the subjects would be given a drug that is suspected of adversely affecting the baby. In our country that study would not be approved.
That’s why some countries conduct their studies in other countries. Apparently that is why some countries develop drugs in other countries. Some people think we were doing that in Ukraine and China.