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It is said, that the harmful alleles get...

It is said, that the harmful alleles get eliminated from population over a period of time, yet sickle-cell anaemia is persisting in human population. Why?

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In sickle cell anaemia,heterozygous condition is benefucual in malaria infected regions because malarial parasite is not able to pass into RBCs bearing `Hv^(A)Hb^(s)`
Haemoglobin .Due to this ,allele is able to persist,which is due to balanced polymorphism or Heterozygote selection or balanced selection.
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