> just not so much at recognizing what’s unfair to others
Or just don't care lol. Children love pushing boundaries. Sometimes it's good (learning a sport, improving a skill, taking on the bigger, scarier feature at the playground) and sometimes it's annoying (wanting more ice cream, staying up late, etc...). I'm convinced it's just part of growing up.
They'll often recognise it just fine if the reasoning is spelled out. They can usually understand the logic, but might struggle to come up with all the steps by themselves.