Yeah fuck him.
It's the kind of sentence that only sounds true but isn't really.
"More lives are more precious than one." Ok well it depends which lives we are talking about. It's perfectly possible that one person might be more valuable to society than a thousand of heartless/useless humans. For example the one guy that could find a cure for cancer is probably more valuable than all of Texas lol.
But would you sacrifice your entire family, wife/kids and all of your friends just to save this one guy that could potentially save the world? You might say yeah because the survival of our race matters more. But is the human race as we know it really that important to save? I think saving our humanity matters more.
Ironically the end of humans might be a good thing for the survival of the planet earth you're trying to save. So by your own logic humans should have a lesser importance than nature itself or the cosmos. So maybe we should all just kill ourselves for this "greater good".