One name, Quentin Tarantino, sums up the culmination of what has become an industry standard in the bloody massacre department. I love his work, and here are some general outlines of why in the United States, nobody is responsible for more on-film violence. Let us examine his work:
Reservoir Dogs - The crime drama about a heist gone bad. The entire movie is based upon the men involved trying to figure out who the rat was. For the duration, one man is lying down, shot in the belly and bleeding all over the place. People were not used to this much gore in the early 90's, and it only gets better when one of the ment kidnaps and tortures a police officer with a straight razor.
Pulp Fiction - Another crime drama of sorts, about how the lives of various people are all intertwined and connected due to their relationships of many types with crime lord Marsellus Wallace. The opening scene was mild compared with what would follow. The enforcers Jules and Vince have to dish out some punishment to some punks who tried to rip off Mr. Wallace. They pull out the pistols and shoot the place up. Later we have a boxer who was supposed to throw a fight for Mr. Wallce, but did not. When he and the crime boss run into each other, it's a slugfest that leads to soddomy. Finally, we have the inside man, the one who informed Jules and Vince about the locale of the punk kids. He gets accidentally shot in the face in the back seat of the getaway car. Oops. They have to pull over and call the cleanup man, Mr. Wolf. The men and car are covered with blood and brain.
Natural Born Killers - I think the name really says it all.
From Dusk 'Til Dawn - In insane crime drama turned into a vampire flick. Tarantino did not direct, but he did write and act in this. The Gecko brothers (criminals) take hostage the Fuller family as a means to get into Mexico. They stop at a locale known as the "Titty Twister" (that's a strip bar with attitude). Trouble starts from the beginning, when the brothers beat the tar out of the door man. After a nice display of full and partial female nudity, the place becomes an all-out brawl. Bikers, Truckers, and criminals vs. Vampires. Everyone who works at the bar turns into a vamp, every customer must fight to survive.
Kill Bill - One movie rolled into two. During the battle between the yellow-haired warrior and the Crazy-88 bodyguards of Oren, so much blood was used that a segment of the battle was put into black and white. It was rumored that this was done to allow the film to keep an "R" rating, rather than moving up to the more extreme NC-17. Mr. Tarantino, you've outdone yourself with this over-the-top martial art, crime drama, blood spraying slashfest.
This is why, in my humble opinion, Quentin Tarantino is one of the most violent film makers of all time.