The Amazon algorithm directs suicidal people towards pure sodium nitrite, which is popular on suicide forums, and the "frequently bought together" recommends bundling it with tagamet, an antiemetic to prevent vomiting, and a suicide handbook. Amazon has been sued about it before, so the execs are knowingly allowing it to continue. Since it's obviously not vital to their profits, the only explaination is that the execs are satanically pro-suicide.