For purpose of discussion, assume that due to bad luck, this asteroid has evaded the detection of all amateur and professional astronomers until about six months from impact. The asteroid is too large to deflect with humanity's current spacefaring capabilities, and the general scientific consensus is that the impact will end all multicellular life on Earth.
What do those six months look like?
I haven't seen it either but wasn't it supposed to be like an explicit analogy for society's inaction regarding climate change?
If so, I'd think it would have to be dumb if it didn't include as a major plot point capitalists preventing the public from knowing about the asteroid, making sure they couldn't do anything about it once they did find out, and then spending billions to send rockets up to the asteroid so they could accelerate it into earth sooner and with even more force.
Yeah it's supposed to be a somewhat farcical allegory about our current response to the looming climate crisis and not just another asteroid flick.
The people in it are dumb in regards to their impending doom specifically because of how dumb people are being irl about their actual impending doom.