of buying guidebooks about travel in the United States when I've visited other countries. I buy them in the language of the country I'm in, if I read that language.
You'd be surprised about the cautionary warnings to tourists coming to the United States. You might not know about those if you didn't read a book written for people in other countries.
Guns are a common topic. Unrest in various cities in the USA is dealt with by warning people not to go to some places in those cities. Other things, like the inability of people in the USA to speak any language but English is covered, too. In one, I was warned that I shouldn't attempt to change currency to US dollars anywhere except at the airport. I didn't really understand that, until I wanted some Turkish Lira when I was on my way to Turkey while in the USAF. I thought, "Well, I'll drop by my Bank of America branch and change some money before I go, for cab fares and tips." Guess what? Nobody at my bank had any idea how to do that. So, I changed some money when I landed in Istanbul at an unfavorable rate of exchange.
People are being warned. You just aren't aware of it.