Convenience. In the 80s, people were starting to get over worked and so conveniences like plastic packaging, microwave meals, lunchables, plastic bottles, etc started popping up. Easy, just grab one. When you’re done, just throw it away! Except, then there was a garbage problem - so they campaigned for recycling! Then reality of recycling hit and so they say - separate and clean it first. Meanwhile people like you are wondering how we got to this madness. Convenience. And some really good marketing. Only about 9% of plastic has been recycled.
The Kodak Fling had to be renamed Funsaver because people were taking out the film and throwing away the cameras. That interfered with their plan to refill the used cameras.
