First of all, on the question of the pine beetle, you'd be hard-pressed to make the argument that the pine beetle erupted because it erupted in a protected area and spread outward. It was a massive eruption because of even-aged class distribution and, likely, climate change. Those were the drivers of the pine beetle in B.C., not that one area was protected.
On the larger question of whether some management activities should be allowed to occur in a protected area that has impacts on the broader landscape or seascape, the answer is yes. They should be allowed to occur, with lots of caveats on that, and it would depend. Look at Riding Mountain National Park where there's an outbreak of bovine tuberculosis. There has been really active management, and successful management, there to eradicate bovine tuberculosis from that national park.
You have to take it in context. You also have to remember that these are our benchmark ecosystems. These are where we understand processes occurring on our managed landscape.