I don’t think “kill fewer people” is splitting hairs.

https://www.washingtonpost.com/climate-environment/2024/08/16/biden-oil-drilling-production/ :

As he campaigned for president in 2020, Joe Biden made a bold promise at a New Hampshire town hall, adding repetition for emphasis: “No more drilling on federal lands. Period. Period. Period. Period.” […] The Biden administration has now outpaced the Trump administration in approving permits for drilling on public lands, and the United States is producing more oil than any country ever has. […] The country is expected to produce 13.2 million barrels of oil per day on average this year — millions of barrels more than Saudi Arabia or Russia.

“producing more oil than any country ever has” is making the biosphere unlivable, and causing a mass extinction which will kill more people.

If enough people vote for green parties, we can reverse anthropogenic climate change and stop the anthropocene extinction. If however we keep voting for the omnicidal lesser evil, then we’re voting for omnicidal evil, and complicit in killing more people.