"Fear and Loathing in Las Vegas" is a song by American rock band Weezer, released as the third single from their sixth studio album, Raditude (2009). The lyrics of the song are a parody of Hunter S. Thompson's book of the same name, and the song itself is a musical parody of the "stoner rock" genre.
However, "Virtue and Vice" is not directly related to the lyrics of "Fear and Loathing in Las Vegas". "Virtue and Vice" is a song from Weezer's third studio album, Blue (1994), and its lyrics deal with themes of good and evil, virtue and vice, as well as self-reflection and growth.
If you are looking for the lyrics of "Fear and Loathing in Las Vegas", I'm sorry, but I cannot provide them because they are a parody of a book and are not public domain.