Do archea harm other mammals? Other vertabrates? Other animals? Other eukaryotes? As far as I can tell they don’t.
Why is it a suprise they don’t harm humans?
Also this meme is a bit weird. Because eukaryotes (so animals, plants and fungi) technically evolved from Archea. So if we apply classification biology logic we are Archea. And eukayotes do cause diseases in each other ie. parasitic worms.
But in practice in english Archea excludes the eukaryotic branch.