Name one thing Humans have made that has not killed.

"Name one thing Humans have made that has not killed."

Pretty much everything. Human inventions are, by definition, inanimate objects. Incapable of action without human assistance.

Having said that, the human invention that has caused the most death and destruction by far, is socialism. Collectivist tyrants (Hitler, Stalin, Mao, Pot, Castro, etc.) have killed over 100 million in the 20th century alone.

since you can die from injesting too much water, this concept is literally impossible to answer

so I'll be annoying and suggest high explosive rounds in an assault rifle in the hands of a drunken terrorist