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Does pineapple belong on pizza?
Spongebob is an annoying character, depriving him of habitat may result in his extinction, which would be a public service, like eradicating a disease
Killing one annoying character could lead to legitimising murder of more characters that are less annoying.
Everybody is annoying to somebody at some time. You can't kill everybody.
Pineapple on pizza is annoying to some people. Eradicating it would be a public service.
Spongebob is such an adored character by so many people and ingrained in popular culture so much that eradicating him won't work - people's memories and his accomplishments will still be around to keep him alive in spirit.