Irreducible complexity argument

[Cordelia]

Why is irreducible complexity so important intelligent design argument that creation points to an intelligent creator?

[Papirus]

Irreducible complexity argument, is just an argument from ignorance. It is one of the "arguments" intended to support intelligent design, but not by proving that there was an intelligent design, but that there was no evolution. The proponents of the irreducible complexity argument, attribute to an intelligent designer those biological structures they believe are irreducibly complex. They say that the "complexity indicates design", but this conclusion is based on the assumption that current evolutionary theory and intelligent design are the only two valid models to explain life.

[jane]

Is the 'bacterial flagellum' evidence of irreducible complexity?

[Papirus]

Is the 'bacterial flagellum' evidence of irreducible complexity?

'Bacterial flagellum' is not irreducibly complex, because if you remove parts from it, it is still functional.
The concept of "irreducible complexity" fails to disprove evolution because evolution can produce things which are irreducibly complex. Evolution could have proceed something redundant that needs later to produce a more complex organ, and then removing some of those later redundant parts.
Even if there is a way to prove that evolution theory is false, it still doesn't prove that the 'intelligent design' theory is true.