Why?

I was enjoying a lovely snowy morning at a park looking for something to take a picture of. Nothing came to sight. I was leaving the park and stopped at a bridge. I looked down and noticed these dead fish. As I looked closer, it seems as though someone dumped their pet fish in the creek. They didn't have a chance. I wish people would just bring their unwanted fish back to the fish store instead of dumping them into environments they can't handle.