Well let's put aside wider questions like good and evil etc. Let's just focus on the design question posed in this thread.
You say good design is indicative of a designer. So what sort of bad design would be present in the absence of such a designer?
Do you think (for example) the human body is an example of good design? What would a badly designed (or undesigned) equivalent look like?
What would the world look like if there was no intelligent design in your view?