"We can't be sober" is a lyric from the song "Sober" by the band Tool. The double negative in the lyrics can be a bit confusing, so let me clarify the meaning for you.
In this context, the use of the double negative "can't we not be sober" is a poetic way of saying "Why can't we be sober?" The singer is expressing a desire to be free from the influence of drugs or alcohol and is questioning why it's so difficult to achieve sobriety.
The song "Sober" was released in 1993 and has been interpreted in various ways by listeners. Many believe it addresses themes of addiction, inner struggles, and the challenges of maintaining sobriety in the face of personal demons. The repeated line "Why can't we not be sober?" emphasizes the frustration and longing for clarity and self-control.