Because as we all know, a leather tanning factory with a revenue of $2,000,000 per year dumping unrestrictedly into a large river, won't kill off a $2,000,000,000 fishing and tourism industry, and cause every water utility on that river to have to pay a few hundred million dollars a year in extra treament to provide drinkable water.
I mean that would just be economic suicide to force that tanning factory to actually clean up its emissions.

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