We need experiments to be done on something or someone before them being used widely by the public. Most of these experiments are for good, but not each one of them. There have been experiments that have just been too harsh and disgusting on humanity.
Here is a list of such horrific experiments. Hope such things don't continue, and we don't have to shame humanity.
Nazis who were considered vermin of humanity and thus all experiments considered dangerous were carried out on them. They chose two random twins and joined them together by sewing them. They were then put on a life support where they died facing agonizing pain till their last breath.
As homosexuals are seen as unnatural (of course love comes with conditions), they had to be cured at any cost. So scientists tried to 'HELP' them by giving them an electric shock and performing castrations.
Forced abortions and heart attacks, hypothermia, frostbite and vivisection conducted on patients. People were forcefully fed with bubonic plague, anthrax and cholera. They were even brutally murdered and then used as experiments for bombings.
A stuttering experiment was carried out on 22 children in 1939 by Wendell Johnson and Mary Tudor. The children were divided into two groups where group A received positive therapy and group B, negative. As a result group B kids started stuttering.
Numerous experiments on female slaves were conducted by J. Marion Sims was afflicted with vesicovaginal fistulas, a tear between the vagina and the bladder. She suffered greatly from the condition and were incontinent, resulting in societal ostracism. They were conducted without anesthesia.
Some extremely poor, illiterate and homeless African Americans were told that they were to receive free healthcare, meals, and burial insurance in exchange for participating for the experiment. While most of them were being deliberately injecting syphilis. The basic intention was to check the dreaded diseases spread and they never really received anything.
The same experiment was conducted on people here. The doctors wanted to see how fast does Penicillin spread to help.
Infants who were only 1 hour to 3 days old, were the subject of this experiment. They were forced to do things you cannot even imagine of.