Thank you for so succinctly summing up the sort of utterly out of touch combined with willful ignorance attitude I've come to associate with Hacker News in general.
Reading this article I'm once again struck by how, as with so many problems in the U.S. is so rare to look outside their borders to learn from what is working in other countries.
Americans seem to have an almost pathological blindness to seeking out the experience of other countries.
Veganism, vegetarianism mostly. Fish oils are now certified independently by IFOS who have an excellent site showing actual tests of retail fish oils, not sure if I can link to it here but searching for "ifos certifications" will bring up the site. Mercury is not an issue for certified fish oils.