The Infinite Regress Problem - Why Can't Groups of Things Explain Theirself?

So why can't groups of things explain themselves? This is the objection. Take a stack of portable hard drives, ecause i'm a photographer. If we have an explanation for each hard drive, then why do we need some kind of additional explanation for the group of hard drives? All the individual explanations could add up to a complete explanation as long as the individual explanations transcend the effect that avoids circularity. But if it's just the turtles explaining the turtles, then we have a circular explanation. It doesn't really answer why there are those turtles in the first place.