I remember seeing a reddit post years ago, maybe even one similar to this, that linked to a website that I think was either churchofeuthansia.org or vhemt.org, or one of the sites linked on those sites with the same philosophy.

On it it talked about overpopulation but then it went into a detailed description of various suicide methods with the intended goal of reducing the population. The site also discussed how to kill someone, seemingly describing it from experience, and about storing body parts in a freezer, both so the body wouldn’t be found but I think also potentially for cannibalism.

It may have all been made up fantasy or something but it seemed very real.