Just because people barter or keep scores, it doesn't mean they can't do other things, like be nice or give gifts occasionally. Honestly, to cut the discussion

Just because people barter or keep scores, it doesn't mean they can't do other things, like be nice or give gifts occasionally. Honestly, to cut the discussion short: do you have kids? I have two kids. Maybe I am doing something wrong, but they are really not all that naturally generous and giving to each other. Must be the toxic capitalist environment they grew up in? How can I activate their socialist genes and make them want to share all their toys with each other?