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Helot rebellions,
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although they don't take place every day,
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take place very sparsely,
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but they keep happening
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so that the fear is never irrational.
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To that is added the permanent enmity of Argos,
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which never gives up the idea of returning
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to the great days of Pheidon with Argos
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as the dominant state in the Peloponnesus
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and that means that the Spartans have to be defeated for that to happen
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and so the Argives come back to the Spartans time after time,
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good stretches in between,