Children do not understand cause and effect to any great degree.

I do understand the idea that it is hard to remember being a child. I look at children related to me and I think - I don't remember being that small and clueless. When I remember myself from 4-7 (a period of significance for me) I recall thinking of things as trade offs or if you want this - it will cost you that and that being willing to pay the price made me responsible. The therapists seem to disagree with it.
I also remember some childhood games/incidents which seemed perfectly rational at the time but now seem rather questionable in terms of my own safety and that of others. Resulting at least once in a hospital run for another child.