The Hallmark DVD transfer of the Sons of the Desert also had added music (fine music by itself, but it should have never been added arbitrarily to the movie) as well as fade outs/fade ins to allow for commercial breaks. I still refuse to buy Hallmark cards to this day because of their shameful treatment of L&H.
As I've noted elsewhere, under current copyright law, apparently the holders of copyrighted material can do as they please with it, including modifying it, neglecting it and even destroying it. But that doesn't mean that they SHOULD do so.
Although the AFI has created some sort of "Honor Roll" of certain features and shorts, I understand it's basically meaningless and has no teeth; it's not akin to Federally mandated historical preservation of buildings and so forth, and does not guarantee the preservation of the films that are listed. And unfortunately the United States has never adopted the concept of "moral rights" that I understand is the law in many European countries, which prevents the mutilation of a creator's work. (And of course, Americans never respected foreign copyrights anyway, as writers like Charles Dickens and Sir Arthur Conan Doyle ultimately discovered). SETH