I could not let this mistaken assumption pass without comment.
You are saying, have said, that "dislike"="hate'' (and others have made the same mistake.)
Over time, certainly the last 50 years or so, we have gotten rather sloppy in how we use what might be described as emotively powerful words.
We have become habituated to conflating the words 'love' and 'hate' with like (prefer) and dislike (not prefer), whereas love and hate describe extreme emotions typically directed toward a person, but sometimes toward an object or situation. But the operative word is "extreme".
Some folks will say I am splitting hairs, but it is not so. Humans communicate by language, and
a word means one thing and not something else.
To lose sight of that is to begin down the slippery slope of misunderstanding what is being said, such that two people might well (it seems) be speaking two different
languages.
Tolkien was philologist. He didn't use "hate" because he well knew the meaning of the word; it was not the appropriate word for what he wanted to say, which is why he deliberately used the words he did: "
I dislike DUNE with some intensity…". (Emphasis added).
I daresay you could read the "
Letters…." book cover to cover and find nary an entry by Tolkien wherein he says he hates something, with the possible exception of war. You will never find him saying he hates some person(s) or other, or even a book. He was never careless in how expressed himself.
We might consider following suit.