There are many theories about society and human behavior that cannot be experimentally tested because of ethical reasons or impracticality. On occasion, there will occur conditions that allow for what are called natural experiments, where social conditions or governmental actions create situations that are suitable for large scale experimental studies that could not have been created by the researchers.
One such case I recall is where a state did not have the funds to expand Medicaid health insurance to everyone in the state who qualified so that they doled it out randomly. This enabled researchers later to study what benefits, if any, access to heath insurance provided, since they now had a large scale test group and a control group. I recall another study that looked into whether raising taxes encouraged people to move to a lower tax state, something rich people often threaten to do when their state is thinking of raising taxes. Researchers were able to study this when one state raised its taxes. They studied a large metropolitan area that was very close to that state’s boundary with a lower tax state to see if people moved a short distance to avoid paying the taxes.
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