This is a really funny joke, but with global population decline in first world countries this is going to be a big issue. Incentivizing people to care for a world they're not going to be around for is going to be fun
The most impactful single decision one can make in terms of not making things even worse is not reproducing. It is the single most sustainable decision in terms of resource use, pollution and climate change.
The fact that people are voluntarily doing this is good, the presupposed "dangers" of population decline are dangers to the systems that demand infinite endless growth, which I would argue are dangers to people in the first place. Fuck 'em.
Some maybe, but it isn't like people who have kids have that good of a track record. No reason to believe people without kids are especially probelmatic.
It is not. More education, more freedom for women to choose a life path, less kids. In some places overwhelming work culture forces this to extreme, where folks focused on career don't feel they can pursue creating a family at all.
Supremacists often tout "replacement theory" which is fake. It claims there is a conspiracy to actively flip demographics with "immigrants" (read, generally folks who aren't of their ethic group) to devalue their position in their society. In reality demographic makeup is naturally dynamic and no one is out to get them, people of all ethnicities are just living their lives.
Hong Kong, South Korea, Singapore, China, Ukraine, Thailand, Spain, Japan.... Are the countries with the lowest birth rate right now. Not exactly centered around "white supremacist" hot spots.