We have different interpretations of the movie. The nukes sent to push the asteroid off course were cancelled mid-air by Mark Rylance (Musk/Bezos/Page/Zuckerberg &c), who started the 'don't look up' campaign, failing to create smaller asteroids, and then rescuing only a few wealthy people. Leo et al knew very well that everyone was fucked after Rylance cancelled the nukes. Nothing mattered after that. There are obvious parallels with the COVID politics (whereas it should instead be a medical science problem) and climate change politics (which is also a science problem, and shouldn't be politicized and allowed to continue).