Perspective
The actual problems on Easter Island are not as simple as that, even going by Diamond's own studies. Several factors unique to the geography made things more difficult than they were for other Polynesian cultures, including a lack of good fishing.
Trying to paste modern political and environmental agendas over the top of this situation creates analogies that aren't valid.
And looking at it from another point of view, the Easter Islanders survived nicely for well over a thousand years on an island of about sixty square miles. Hawaii wasn't colonized by Polyesians until about 200 years after Easter Island.