It's a difficult call to make but it has been suggested that an effective way of protecting island species (the most seriously endangered) is to remove inadvertently-introduced mammals, notably dogs, mice, pigs and rats (https://www.theguardian.com/environment/2019/mar/27/cull-invasive-mammals-to-save-island-species-experts-urge). This has been shown to be doable, humans are generally responsible for their introduction in the first place but the 'offending mammals' are only doing what they are programmed to do.
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