Have you considered that you might be making a wildly inaccurate assumption that island ecology tends toward homeostasis? Does it bother you so much that someone might believe that disruption and wild fluctuation might be much more typical of ecosystems, even without the intervention of Homo sapiens sapiens?
Your question has an obvious, widely accepted answer... Whether that answer is right or wrong, your failure to reference it comes off as deliberately provocative.
And by your response, it seema pretty obvious: Yes, you knew full well the answer before you sarcastically asked your orignal question.
If you ask questions in bad faith, using an argumentative tone--then why are you surprised when I respond to you in the same fashion?
If you want better replies, you should try writing a better post, in the first place.
From https://news.ycombinator.com/newsguidelines.html, under the section "In Comments" (halfway down)...
> Be kind. Don't be snarky. Have curious conversation; don't cross-examine. Please don't fulminate. Please don't sneer, including at the rest of the community.
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> When disagreeing, please reply to the argument instead of calling names. "That is idiotic; 1 + 1 is 2, not 3" can be shortened to "1 + 1 is 2, not 3."
...
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...
> Please don't pick the most provocative thing in an article or post to complain about in the thread. Find something interesting to respond to instead.
This is pretty basic history, with endless examples of human societies that took short-term gains by screwing with ecosystems for more complex than they could understand... Only to leave behind horrific costs for their descendants and neighbors? And that some of those costs proved so high that they wiped out the societies that came up short, when the bill came due?
Are you aware of the countless famines, wars, wildfires, floods, and other disasters that happened as a result? Do you know the body counts of these choices?
If you're honestly just ignorant of all this history, I'm gonna suggest that you start by reading Mark Reisner's masterwork:
• https://en.m.wikipedia.org/wiki/Cadillac_Desert
And then maybe follow it up with Jared Diamond:
• https://en.m.wikipedia.org/wiki/Collapse:_How_Societies_Choo...
If you can at least digest those, whether you agree or disagree with their theses--then I think we'll be ready to have a useful discussion about the wisdom of human interference in existing stable ecosystems.