What if reducing birth rates at this point in time is rational?
On the employment side, we have rapidly advancing automation and AI that are dramatically reducing the work force required to maintain society.
On the ecological side we have a combination of climate change, soil depletion, and many other factors that at least threaten to impose a bottleneck on us. We are smart and adaptive but adapting takes time and energy. During the transition it may be harder for us to support vastly huge populations.
Put those things together and… are we, in fact, doing the rational thing here?
Keep in mind that no trend is forever.
In the 1970s people predicted global Malthusian collapse in part by extrapolating past birth rates infinitely far into the future.
Seems to me that population collapse alarmists are doing the same thing. “If this trend continues forever there will be nobody left!”