The violence in Training Day really isn't that bad; it alone would not be enough for an R rating. Although realistic (brutal/not stylized), there really isnt much violence at all and none of it is very graphic. The real issue is the language. I've never been bothered by language and never thought I would be, but Training Day did it. With 200+ uses of the f-word, some of the things said in the movie are so discusting I felt like taking a shower after seeing it. If it tells you anything, there were not enough profanity-free lines in the movie to make a full-length trailer, so they had to censor most of the things spoken in the trailer.