This is no surprise.
Facebook is in the business of eyeballs, and action is taken only when content is so contemptible that it impacts the bottom line:
Facebook’s algorithm “actively promotes” Holocaust denial content according to an analysis that will increase pressure on the social media giant to remove antisemitic content relating to the Nazi genocide.Facebook's basic algorithm is, "If it increases clicks, it makes us money," which is why we see it supporting genocide against the Rohinga in Myanmar, Muslims in India, etc.
An investigation by the Institute for Strategic Dialogue (ISD), a UK-based counter-extremist organisation, found that typing “holocaust” in the Facebook search function brought up suggestions for denial pages, which in turn recommended links to publishers which sell revisionist and denial literature, as well as pages dedicated to the notorious British Holocaust denier David Irving.
The findings coincide with mounting international demands from Holocaust survivors to Facebook’s boss, Mark Zuckerberg, to remove such material from the site.
The ISD also discovered at least 36 Facebook groups with a combined 366,068 followers which are specifically dedicated to Holocaust denial or which host such content. Researchers found that when they followed public Facebook pages containing Holocaust denial content, Facebook recommended further similar content.
Jacob Davey, ISD’s senior research manager, said: “Facebook’s decision to allow Holocaust denial content to remain on its platform is framed under the guise of protecting legitimate historical debate, but this misses the reason why people engage in Holocaust denial in the first place.
“Denial of the Holocaust is a deliberate tool used to delegitimise the suffering of the Jewish people and perpetuate long-standing antisemitic tropes, and when people explicitly do this it should be seen as an act of hatred,” he added.
Zuck don't care, he never has.