On our planet we don't kill one another
We don't take love for granted
It's a gift from the mother
In your planet, you are filled with greed and false belief
We came here to bring you peace

from Justin Bieber (Ft. Lil Wayne) – Backpack Lyrics on Rap Genius

Meaning

Bieber and Wayne consider themselves to be both aliens (different from the norm). The planet is symbolically their own being. We are all are own little planets.

Mothers tend to show love to their children and the nature of affection grows on them. He’s also playing on how beings refer to their plant as “Mother” (ie. Mother Earth).

The last furthers the concept and belief that aliens, if they ever came, would take over the world violently. A common cliche in media is extraterrestrials saying “we come in peace”. However, they come to save you from your ills and really bring tranquility rather than destroying your society.

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