An interesting post on the subject of book banning, https://ckbookspublishing.com/2019/09/27/book-banning-is-it-right/.
As someone who read history and politics at University College Swansea, I am aware of (and concerned by) works which deny (or greatly downplay) the horrors of the holocaust. Long before the rise of the internet, pamphlets such as “Did 6 Million Really Die?”, and “The Hoax of the 20th Century”, peddled the wholly erroneous and poisonous view that the Nazis had no plan to wipe out European jewry. However, since the birth of the World Wide Web books such as this (previously available in back street bookstores or via mail order only) can now be obtained with the click of a mouse. Indeed much of this material is freely available online.
In my view the best way to deal with such unhistorical rubbish is to shine the lense of truth on it, rather than ban such works. Whenever “literature” of this nature has been exposed to proper examination it has been revealed for the trash that it is, (see, for example the various court cases in which holocaust deniers have been proved to be peddlers of untruth).
Also, by banning an idea, one risks making it “sexy”, and one may (albeit unintentionally) help to foster the view that “the establishment” (whoever they may be) have something to hide. So no, book banning is not the answer.