The worst "human experimentation" in human history would be the dropping of the atomic bomb.

As for human experimentation, the one that comes to mind would be that of World War II.

The horrific human experiments conducted by Nazi Germany and the Japanese Army's 731st Unit immediately come to mind, but it is presumed that there are too many human experiments that have been buried in history until then.

Among them, human experimentation that violates human life and dignity, so to speak, "out of curiosity" and "playful," is absolutely unacceptable.
At present, it can be said with certainty that the most worst of these was the "atomic bomb dropping"

Is that party the United States or Japan? Because it doesn't really matter.

"The worst human experimentation in the history of mankind" is the dropping of the atomic bomb.

This is because the atomic bomb "completely exceeds the category of weapons and cannot be called a weapon."

Many hibakusha and anti-war people are actively shouting, “Nuclear weapons abolition!”

This is because ``the atomic bomb is not a weapon, it has no meaning to exist, and is only used for human experiments that violate human rights.''