It has a lot to do with how science has been communicated over the last few decades.
The basic idea being that the “design inference” is an illusion and that the design like appearance in nature is a result of natural selection.
Even today, most lay people don’t really know that selection is thought to have a much smaller influence than previously thought.
The question to ask is, what if anything does science say about the inference of design from observing nature.
Arguments of bad design is a good example of Science being used against the design inference.
Edit: It looks like biology has moved on from selection based models of Evolution while continuing to use selection as an explanation for the appearance of design in life.