alt Hacker Newswhat percentage of their income does "almost every childless person" willingly sacrifice for some greater good?
how much do they care about the hardships of currently existing strangers, beyond sending thoughts and prayers on reddit?
just consider how preciously few Westerners had gone to die in Ukraine over the past 5 years, despite the deafening cacophony of virtue signaling on the Internet.
You're tying together some pretty far-flung strands of argument there.
Regarding children and selfishness: some of the most selfish people I know have kids. They're selfish in the sense that they only care about their family, even to the detriment of everyone else.