Evolutionists insist too much that everything that exists was produced and perfected by natural processes that follow laws that no one dictated, so how are they going to be able to know how to detect design?
I agree. But they fail in one major way. Irreducible complexity has never been shown to evolve through natural selection. There's no empirical evidence for it. I just had a debate about this elsewhere once again in the Philosophy section and another website.
Scientists have tried hard to create theoretical models with assumptions based on hypothetical statements to show how it could evolve. But that's the problem. Their failure is to have real empirical evidence of this to corroborate their models, which makes everything they are doing just guesswork and not really scientific. They have absolutely nothing to make even an informed opinion on in this matter.
And they don't understand irreducible complexity. The components cannot be reduced to an even simpler state to make something work unless you want to run the very great risk of destroying everything. It's extremely challenging for Darwinian evolutionists to reconcile this with their paradigm. If you take one component away, the whole system malfunctions. Even if just one component is underdeveloped, the whole system becomes at the very least very faulty. There's nothing for natural selection to take advantage of in any intermediate steps if all it can do is lead to dysfunction after dysfunction. No advantage here. These biological systems and processes would have never existed in the first place if the components to make them work tried to evolve.
Therefore, it's extremely, extremely unlikely to have evolved through natural selection in a step by step intermediary process. In no way do their theoretical models discredit the argument for irreducibly complex systems as very strong evidence for a designer, be it God.
I've made a strong argument for it already here with the 'DNA Polymerases-Helicase-Tau protein connection' which acts on your DNA repair process. And there are many, many more arguments underway like the the Bacterial Flagellar structure, Ribosomes, ATP Synthase Molecule and much more. Plenty of very well designed mechanisms and parts to make something work precisely.
Please, I bet Charles Darwin would have a coughing fit if he saw today the discovery of such marvelous and beautifully designed engineering displayed in nature. And the argument is so simple. Just like any computer operating system or mechanical machine, take away a component or two to make it work or cripple them and you got yourself and now terribly broken or extremely dysfunctional system.
Tell natural selection to take a hike!