Well, that's the old Philosophy 101 argument and, while it's not logically incorrect, I still view kindness and altruism as being those conscious acts to help fellow living beings on our shared blue marble, that don't inure to the physical benefit of ourselves or our family "tribe".
Yes, there are sporadic acts of selfless kindness elsewhere in the animal kingdom, but not with the frequency or complexity that humans do for others. That said, we kill other living beings in spectacularly complex ways, so there is that gapingly exposed flank in my argument.... :hihi: