That’s cute and all, but it ain’t gonna be birds and deer who gets life off this rock once the Sun starts threatening to swallow it in a few billion years. We’re screwing up badly in the short term, but we’re the only hope Earth life has in the long term.
So? Death from old age is inevitable too, that doesn’t mean I’m going to stop breathing or eating. All of life is just postponing the inevitable, but just because the inevitable is inevitable doesn’t mean we should stop postponing.