I'm not sure. It would be good to prevent spread of disease. But also, Tesla's mission (https://www.tesla.com/about) is "to accelerate the world's transition to sustainable energy." This is a generational timescale business - in Musk's mind an extra 1.5% of population dying is probably worth it - especially if the alternative is Tesla dies.

Edit - here's an interesting question - how many lives is accelerating the world's transition to sustainable energy worth? Climate change is surely going to cost lives. Tesla also isn't really the best solution in my mind. I think we should all live in denser cities where you can walk, bike, and use transit.