I've never heard that argument myself. I think that most creationists believe in eugenics, that species can improve or change over time (i.e. dog breeds), but only reject that species evolve into other species.

It seems a poor argument in that first eugenics does not require Darwinism and secondly as mentioned in the other reply propositions should be accepted on if they are true or not, not on there consequences.

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Gary V.
Cornerstone, URC
Hudsonville, MI