That may be true but we do not observe it in nature. Most mammals would prioritize their own offspring over others. "Without regard" is very rare to see
Re:Pëtr Kropotkin and Mutual Aid
by jrochkind1 on Thursday December 22, 2022 @12:36PM
(#34096011)
I think what "we observe in nature" is debatable. Kropotkin was taking part in that debate, although it was over 100 years ago.
But apparently in 1998, respected evolutionary biologist Stephen Jay Gould found Kropotkin to be "no crackpot" too. (Article found from wikipedia reference).
https://www.marxists.org/subject/science/essays/kropotkin.ht...
There's plenty of cooperation between population members not directly related observed in nature, that's literally what Kropotkin's whole book is about.
I don't really want to get into the whole argument here -- it's one of those that we will go on forever with.
But the Kropotkin point of view would probably point out that humans as a species (and any species, in fact) have improved survivability and natural selection when we cooperate with those in our communities/populations without regard for family relations.