No positive messages here. The hero is a terrible role model who avoids trouble thanks to luck and bad behavior, rather than redemption or realization. The movie's ambiguous ending suggests some kind of redemption, but it's most likely false.
Characters pull and fire guns, and there are a few fistfights, but the bulk of the violence is verbal: characters exploding in rage and frustration and threatening others. Viewers also see the aftermath of a murderous crime scene, with bodies strewn about, and there's a fatal shootout that involves blood and falling bodies.
Hardly any nudity shown, but there's plenty of sex talk and sexual situations, mostly dangerous and illicit. The main character visits his prostitute girlfriend several times while she's with "clients"; a pair of gangsters discusses having sex with her as payment on a debt that he owes. The same character attempts to sleep with a pretty traffic cop; she strips to her underwear and crawls onto the bed, but he's passed out. In another scene, after the main character busts a young couple, the girl offers him sexual favors, which he accepts -- they include kissing, grinding, and touching of private parts with hands (though again, no real nudity is shown).
A constant barrage of "f--k" and "s--t" in all their variations (including the favorite: "s---bird"), plus a few uses of the "N" word ... as well as just about every other word in the book.
Drinking, Drugs & Smoking
The main character is addicted to painkillers (Vicodin), cocaine, and heroin and drinks alcohol at all hours of the day. His girlfriend also takes drugs. His father is a recovering alcoholic, and his father's wife is a beer-drinking alcoholic. Drug dealers are everywhere, and various drugs are often on display. Occasionally, the main character experiences weird hallucinations that feature various swamp creatures and reptiles. No children are shown involved with drugs.