Instead of arguing over something well-established and well-documented, I'm just going to leave an NPR explanation of it for you or others to read at your leisure.

https://www.npr.org/sections/parallels/2015/03/21/394273902/on-libel-and-the-law-u-s-and-u-k-go-separate-ways#:~:text=In%20American%20courts%2C%20the%20burden,of%20proof%2C%20and%20typically%20loses.

It might surprise you, but you can prove a negative in a court of law, and you actually have to in the US for defamation, unlike European libel laws.