Penguins are cute?
This one is kinda complicated. I'd agree that if not for humans the environment would take care of itself, and on that hand we should leave it alone. OTOH, they've invested 25 years of time and money into studying this particular area, so it would be a bit of a waste to let all that effort starve to death.
Then again ... If studying nature is the point, and nature put that berg there, well ... study what the penguins do to survive.