As their mission statement has it, "organize the world's information and make it universally accessible and useful":
https://www.google.com/intl/en_us/search/howsearchworks/our-approach/
The tacit argument is, "Sure, we repeatedly violated antitrust law in order to monopolize the internet, but the internet *needs* a monopolist. It's scary out there! We have amassed power so that we can protect and guide *you*."
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