Pardon me for playing devil's advocate, but wouldn't an increase in nutrient levels promote growth in the coral reefs (bacteria feed the sponges, nutrients feed algae which feeds fish, turtles, and much more). Of course that also would have to be in "reasonable" quantities, which may be the reason that this is more of a problem than a blessing, that they're not "reasonable quantities.
Also, something to consider is that they're not releasing things like heavy metals, VOCs, and other hazardous wastes, but more than likely simple nitrogenous wastes (feces, etc) after they've been everything but sanitized.
I'm not calling anyone out, but I hate reading things like that that hardly give you any more information than a "hot button" scenario/situation/topic that your knee-jerk reaction to is of course negative.
Also something to keep in mind, is that the optimal level of pollution is never zero.