Many people buy products and find defects that can actually cause significant harm. However, no matter how dangerous the defect or flaw may appear to be, it will almost never be possible to file a defective product lawsuit unless you experienced some kind of injury or damage by the defective product.
The reason for this is that the entire contract of personal injury law is predicated on the fact that people should be able to hold liable parties responsible for damages incurred to them. If there were no damages, though, there is no room for a personal injury lawsuit.