What is fear and loathing in las vegas about

So according to Google, "Raoul Duke (Johnny Depp) and his attorney Dr. Gonzo (Benicio Del Toro) drive a red convertible across the Mojave desert to Las Vegas with a suitcase full of drugs to cover a motorcycle race. As their consumption of drugs increases at an alarming rate, the stoned duo trash their hotel room and fear l egal repercussions. Duke begins to drive back to L. A., but after an odd run-in with a cop (Gary Busey), he returns to Sin City and continues his wild drug binge."