Liberal societal goals (many of which I happen to support) include preservation of the natural environment, robust sovereignty of oppressed indigenous populations, increased availability of housing and resources, and in general an profound sense of the importance of any individual within their community. Every single one of these goals becomes easier to achieve the fewer people there are within a single geographic area, so why are these complaints about declining populations always coming from left-leaning thinkers and speakers? (I know Reuters isn't exactly left wing, but the language they're using is identical to 'progressive' politicians all over the west.)
The time immediately following the Black Death in Europe was a massive boon for the (surviving) commoner. When people talk about declining populations in Western countries, I imagine razing the unsustainable, disgusting post-war boomtowns, layering farmland and forest over their remains, and pushing a philosophy of local self-reliance born out of community solidarity. It is truly unnerving to see so many publications talk about this issue and imply that the only hope for any nation with a declining population is to bring in as much supplementary labor as possible. I can only hope the people of Singapore are happy with whatever their economic leaders have decided is best for them.