from what i understand, the seals are expanding their range southbound as fish species such as herring and mackeral are being wiped out / depleted in northern waters - leading to more seals here. basically, they're adapting to our impact on the ecosystem by expanding in search of food. its not their fault that they found very confortable living conditions here.
i'm not saying that seals don't need to be controlled now (although it will never happen) - just that its our fault that they are here and is such numbers. they were never meant to have a predator on any large scale. Sure sharks and man take a few in nature, but they are pretty close to the top of the food chain as adults.
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