Another significant factor is the belief we are in the end times and thus whatever we do doesn't matter (or worse, may delay the end). A large minority believes this[0], but they have outsized influence among politicians, at least in the US.

Further, they believe that their holy literature is perfect and because science changes, science must be wrong[1]. Therefore, we should just follow what the book says, which is that there will be a rapture.

0: https://www.pewresearch.org/fact-tank/2010/07/14/jesus-chris... where christ's return means the end times. 1: unfortunately I don't have a citation for this, but it's something I've seen a lot.