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Actually it's not strictly true that the fish's mouth issues are caused by anglers... a member of our family has a large Koi pool and he got some fish from a local fish farm for the pool as fingerlings, they have never seen a hook in their lives, but a couple of them have deformed mouths... it's a genetic thing caused by selective breeding for size and growth rates... using a small gene pool often throws up mutations and this is why you'll often see young fish with deformed mouths.... yes I do agree that bad unhooking, using overgunned rods, too large or too small a hook, and overstriking can cause damage... but it's not always the case

I'd say some of the fish are deformed because some of the people fishing the lake have no idea about fish care. The other reason is I expect the owner brought a job lot of stunted fish.