Could the scientific method be complete crap in real world situations? Think of early man out on the plains. If early man noticed a child get bitten by a venomous snake and then swell up and die or suffer pain and disability for a while, would he turn around and say to his tribe members: " Lets get 100 children and put 50 of them in a corral with venomous snakes and 50 in a corral without. Which ones will swell up?" NO.
Those type of "experiments" aren't for the real world. To survive people need to make an instant judgments. We don't have the ability when it comes to survival to keep "testing".
Example: Bill Gates stated in George magazine that he was into "population control". Now we see anything he's involved with result in death and disability. We have enough evidence to say he shouldn't be messing around with mosquitoes (living hypodermics) or vaccines!