It went off the rails with Game of Thrones. Before that hyperviolence was found mostly in horror movies, and that's fine imo, it's a specific genre. But nowadays it's in so many shows and movies.

All the american action movies we watched in the 80s and 90s with Rambo and Schwarzenegger etc were all about violence? Most American movies seem to work guns into them somehow too.

American TV has always been violent. It may have been less gory in the past, but there has always been gun fights and fist fights and violence of many kinds.