As an example of this, if Andrew Tate, currently facing trial in Romania for rape and human trafficking, wrote a book promoting his views which include the stuff he's on trial for, should a library carry it? Given how influential his views already are on young men, you can imagine what effect a proper book rather than a few videos could have - if you look at Alex Jones' book on Amazon it gets nearly 100% five-star reviews, so 100% of people who read this thing believe it and (presumably) will act on it.
It terms of "it's available on the Internet", so are videos of... well, apply Rule 34 as required, but that doesn't justify having the same stuff in a library.