Coming back on to say:
When my DS was tiny, there was a “mommy blogger” with 4 kids (two older boys and a set of girl twins) who had some very interesting house rules. The main one was the following triplet:
Safe, respectful, kind - in that order
And that set of rules covered all eventualities - so they didn’t need a whole list of “don’t hit your brother, don’t throw food on the floor, don’t splash the bath water,” they just needed “safe, respectful, kind” in that order.
The illustrative example she gave was this. Small child runs onto the road. First thing you, the adult, do is run and grab the child and pull them off the road. Safe first. Technically it was disrespectful to the wishes of the child, who wanted to run onto the road, but safe always comes first. Technically it was also possibly unkind - you probably scared the child with your response, you might have hurt their arm a bit. But safe always comes first.
Once you have a safe situation, then you deal with respectful. Respectful, she described (knowing her audience was her young children) as being safe towards other people’s feelings and belongings. So just because you’re not being unsafe by drawing all over your brother’s new trainers, you’re not being respectful - they’re his, and it’s his decision what happens to them. And just because you aren’t being unsafe and physically hurting your sister by calling her names, you are not being respectful - you are hurting her feelings.
And then once you have a safe and respectful situation, then you can think about being kind. And kind is when you go above and beyond - when you offer someone some of your snack, or you help them tie their shoelaces when they’re struggling, or you tell them that you like their drawing. It’s doing something extra to make someone happy. But kind is useless unless you are first safe and respectful - it would be kind for me to let my DS have ice cream for breakfast every day, but it wouldn’t be safe to his health. Same with respectful - it might be respectful for a child to obey an adult who tells them to break the law, but it isn’t safe.
I don’t know if that helps at all, but I had forgotten how much that helped me get my head around why “be kind” was just much too simplistic.