English is a very front-loaded language, information-theoretically, isn't it? Often the first few words of the sentence tells us everything we're going to need to know about the rest of it.

Yeah but f.. off simply does not say the same thing that his letter says, now matter how succinct.

He writes like he assumes good faith, then explains why he thinks that exactly this attempt won't be fruitful, giving a good-faith argument for why Oswald should consider further correspondence fruitless, unless he changes his whole political ideology.

That's a lot more than just "I don't want to talk to you and I think badly of you"

> English is a very front-loaded language, information-theoretically, isn't it?

It's more that journalism and in other context though, it is good writing style to "not bury the lede", i.e. put the main point upfront. It's a writing choice, not a language feature.

The point is that a large percentage of the words in any sentence are there to provide structure, not meaning.

Removing those words makes the text more difficult to understand, not easier.