Jasper Doomen can't handle the nihilism

"Reason is [...] only an instrument for survival; no insights into the truth or the nature of reality, whatever one may want this to mean, are to be expected. [...] If this is indeed Darwinism’s explanation of reason, it refutes itself epistemologically. After all, if the reasonable being that concludes to Darwinism’s truth (again, whatever one may take ‘truth’ to be) only does so on the basis of reason as a means to survive rather than as a faculty to establish the truth, Darwinism itself is not the truth. There is, in that case, no ‘objective’ standard (or any standard) to determine this, let alone that Darwinism would be entitled to claim this role. Consequently, if Darwinism is consistent, it cannot exist: it reduces the very faculty required to found its truth to an instrument that lacks the ability to perform this task.

If this life is really all there is, why should one be occupied with any scientific or philosophical matter?

The pleasure of this insight and the other pleasures of life must be balanced against the pains one suffers; if there is more pain than pleasure, it would be prudent to commit suicide. This radical hedonic calculus is perhaps rather abstract (it seems difficult to find a common standard against which to measure the various feelings), but this is the only course of action a Darwinist can follow if he is to take his theory seriously. Perhaps there are lives that can withstand the radical hedonic calculus, although I can hardly imagine such a life, if all experiences are seriously taken into account. It is, in the end, only the individual that can determine this for himself or herself, but it seems that Darwinists are bad economists.

Either Darwinism reaches its peak through the insight that one should commit suicide, or Darwinism is incorrect, either because those who propagate it have failed to comprehend that suicide should be committed—those who have comprehended this have already done so—or because another, less reductionistic, approach is taken to be correct. (The latter approach might also propagate committing suicide, by the way, but that is not the issue here.) Darwinism would then, ironically, consist in the demise rather than the survival of the fittest, if one understands by that those who have the greatest insights." (Jasper Doomen, Concerning Darwinism)