In order to not cause chaos, they lie (by denying climate change, sowing FUD) or ensure the issue isn't mentioned/covered (by owning media, self-censorship). "Keep calm, everything is going extremely well."
I believe Earth isn't badly off with a lot less humans, I just don't like the distribution of survivorship isn't going to be random. Survivorship bias is going to contain heroic stories, but in the end a lot of people without power/money are going to take the shortest straw. And, that wasn't necessary.
The track Extrawelt - Phoebe has an excellent quote on the matter. Paraphrased:
> "We would be the first lifeform that wipe itself out. But what is unique is we did it knowingly. Why didn't we save ourselves from [...]? Is the answer, we weren’t sure if we were worth saving?"