Who would want to learn his speech by heart?

I happened to visit a bookshop in a huge mall yesterday. On a shelf, among other books for learners of the English language, I glimpsed a book about Donald Trump's speeches during the election campaign. If I am not mistaken, the title was "The Speeches of Donald Trump". I wonder who needs to purchase a book of this sort to study the English language. He is addicted to name-calling and almost all his speeches are outrageous. I don't think his English is appropriate if you want to learn polite English. Also, his sentences are sometimes vague and grammatically irregular.

Do you ever think of memorizing these sentences?
"I don't believe in human-induced global warming.
Vaccinations cause children to get autism.
If we use chlorofluorocarbon gases in a closed room, it does't affect the ozone layer."
The above excerpt is from "Fears spread over Trump's anti-science remarks"(The Japan News by The Yomiuri Shinbun)