For
It can protect animals from disappearing due to habitat loss.
Against
It may disturb new ecosystems and cause new problems.
Anonymous excerpts, translated where noted.
“My suggestion is to disperse some endangered animals that have low birth rate, like eagles, to other locations so that they won't get extinct.”
“having been released there in case they ever went extinct in their natural habitat again.”
“introducing a species to a new habitat can have catastrophic consequences for native species”
“You could end up killing off more species than you save.”