Galactus isn't any more of a villain for eating planets then we are for eating plants. And him choosing not to would unleash Abraxas who is a multiverse threat cause he would then go kill Galactus' equivalents in other universes so that that universe's Abraxas is released.
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Official Mienshao of the pokemon B/W and BW2 clans
Comic pull list: UXF, WatX, XML, Avengers Academy, Defenders, Secret Avengers, JLI, and Batwing