Do you know what the forest service does? They are a conservationist organization within the US government. It's one of the most unambiguously positive parts of the government.

My relative would tag specimens of protected and endangered species of owls, note their locations, and then prevent loggers from destroying those habitats. [Relative] is a hippie environmentalist, and they literally would not have taken a job that harms animals.

More info on the forest service PDF download

Killing invasive species protects countless other species from extinction, so it has to be done. Those invasive species have their own habitat elsewhere, so they're not threatened, and they have to go.