Killing some animals to save others

It is OK to make humans bear huge costs to save the lives of species, but it is wrong to kill a few Kangaroos to save some species? I get the basic idea: it is wrong to intervene in nature, but humans are not part of nature. Here is an example now from Australia:

Authorities say the overabundant kangaroos are crowding out other native species, but many animal rights activists are against the killing of Australia's beloved national symbol. . . .

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Killing some animals to save others
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Oleh