Unlike your first source, this one does not even attempt to quantify what percentage of the variation in ME is explained by genetics. This only says that genetics plays a role. You need strong evidence to credibly state a monocausal explanation for something like ME.
This is an unnecessary ad hominem.
> https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3643988
Unlike your first source, this one does not even attempt to quantify what percentage of the variation in ME is explained by genetics. This only says that genetics plays a role. You need strong evidence to credibly state a monocausal explanation for something like ME.