To expand on this, the counter argument of “suboptimal” design misses the ID theorist’s point. It’s not about the most optimal design but about “irreducible complexity”. I have my own qualms with the idea of irreducible complexity, but “suboptimal design” is a bad counter argument in itself.
ID as a science is no weaker than Darwinism is as a science in explaining the progression of species from simple to complex beings.
ID’s weakness: The idea of “design” is one of common sense. It is not measurable in the sense that one can draw a line that separates that which is designed and that which is not, and another line that separates that which is complex from that which is not. Having a key attribute – design – that cannot be measured and mathematically modeled, science must drop out as a strong ID proponent.
Darwinism’s weakness: First, the mechanism claimed that works on random mutations, natural selection, cannot be verified. We have evidence of different kinds of life and evidence which indicates progression from simple to complex beings but no evidence of natural selection as the driving mechanism. “Survival of the fittest” is pure theory, rational but not empirical. Second, randomness is a perceptual claim rather than an observational claim. That is, if one cannot see the cause to effect then, in ignorance, one only perceives the effects to be random. Fair enough for now. The molecular biologists will illuminate us, hopefully, soon.
As we are in the philosophy forum, we can also size up the two theories as philosophies on the origin of species. Philosophy does not limit its inquiry to the same constraints as do the empirical sciences. But philosophy does limit the movement from observation to logical inference based on metaphysical principles. Darwinism fails as a a philosophical explanation primarily, but not exclusively, because the theory violated the principle of sufficient reason , i.e., an effect cannot have properties not present in one or more of its causes.
ID does quite well as a philosophical explanation of simple to complex beings. Taken at its most complex, ID offers the only explanation for the human mind. The human mind possesses the properties of intelligence, abstract reasoning and free will. Only a being possessing those properties can be the cause of beings with those same properties.