Agreed. Especially Sam Peckinpah. "Straw Dogs" is one of my faves.
Furthermore, the ratings system was all but ignored. I was seeing R-rated films at the tender age of ten, and UN-rated films like "Dawn Of The Dead" and "Cannibal Ferox" were widely available, no questions asked, at the local video store.
Sam Peckinpah? How about George Romero, Lucio Fulci, or Ruggero Deodato? Talk about gorefests.