Indeed it is this kind of idiocy that turns people off revisionism altogether, when in fact it is a serious field that has contributed enormously to progressing the much needed, and much stifled, research on WW2 atrocities.

For the intellectually curious I'd say steer clear of any website with a swastika. Start with Skeptic magazine's Michael Shermer "holocaust debate" with Mark Weber (available on Youtube) for a civilized discussion, based on documents, among intellectually honest people. If you want something to read regarding revisionist arguments, I can recommend Arthur Butz's PDF book (a fellow computer scientist) available online. For the mainstream arguments I recommend the relevant parts of Hilberg and Arad and then Pressac's books on gas chamber operations. This will equip the student with enough knowledge to be able to talk about the subject intelligently.

This was the only safe way I could find of starting this research since a lot of material online seems hell-bent on blaming Jews for everything. I never understood this spurious connection. I don't hate anyone, and I was curious to know how exactly millions of people could have been killed in such a systematic way. So I started looking for material without the hatred and it does exist, but it leads down a deep rabbit hole with very few certainties. Gas chambers are one of the hardest problems for historians to explain and the most prominent researcher in this area, Jean-Claude Pressac, has switched between mainstream and revisionism a few times because of that. That much should entice the potential student.

Near-unanimity among academics happens when there is great political pressure. Even the Pope's political enemies in the 13th century conceded to his altered version of 4th century history (https://en.wikipedia.org/wiki/Donation_of_Constantine) that was used as a device to support the Pope's political authority. Today, Israel needs a similar political authority, and as Norman Finkelstein argues, it finds such authority in the mainstream holocaust narrative. Hence the political pressure against progress in this field, and hence the laws against discussing it in Europe.