Welcome Peevan.
I agree with you, to a short extent... as a general thory, what you're saying makes sense. And if Mr. Jackson and his cronies had actually stuck to this, most of us wouldn't be so angry (I would, but that's just because I'm a purist). However, if we look at the changes, many of them (I'd venture to say most) cannot be reasonably justified by saying that this is a translation of the book to the movie.
Arwen at the fords comes immediately to mind. If anything, the original coming of
Glorfindel then
Frodo's lonely stand are far more dramatic, decent "movie material" than any "If you want him, come and claim him" crap. Every single bit of dialogue we've seen has been fabricated. Take the scene in which
the Ring is thrown into the fire at
Bag End. In the book,
Gandalf says of his translation of the verses: "But this in the Common Tongue is what is said, close enough." In the movie,
the simple sentence structure is altered, running something like this: "In
the Common Speech, this is what is says." No big deal, you might say. But
why? Why change and twist a literary masterpiece apparently on a whim? Why give
Legolas boots, or
Gimli a
helm, when they have neither? Why have Gimli attack the Ring with his
axe at the
council of Elrond? Why make Gandalf and
Saruman do battle? Why not include
Radagast or my favorite character, Glorfindel?
Other changes, such as the cutting of
Tom Bombadil, can be recently justified. I, for one, still would not agree. But as for the other perversions... there is no point.