What would you feel if you came to a fish store filled with sick fish?

There's a new mall opening in Indonesia and there's an shop there (I couldn't tell you the name, because it might be considered as badmouthing, but this is a true story) There's a midnight sale too there. So my family decided to split up, I went to the pets part, and they sold some fish. One of the tanks are full of sick comets/oranda with ick, anchor worms, fish lice and there's even one with cut gill covers. Even in the oranda tank (not with comets) they leave a dead oranda floating around. And they also sell neon tetras, but they said it's a cardinal and they sell it with a price of Rp 12.200 (US$ 1.2 but in my country that's four times more expensive than a neon tetra's normal price). And in the plants' tank, I saw white fluffy stuff, I wondered what it is. And I actually discovered that it's a dead fish covered in fungus. And there's also a sick comet in the other plants' tank. How would you eel and what would you do if you visit a store just like this?