I get what you're saying, but I think that analogy doesn't really capture the gravity of what happened. Both of them have committed egregious war crimes, which means people aren't just beat up, they're dead. Israel has certainly committed an order of magnitude more, but I don't think it does the victims justice to imply Israel is the big, strong adult who merely got kicked in the shins by Hamas.

I think your analogy could be improved if you changed the 9yo vs Mike Tyson to the 9yo's adult cousin who fights Mike Tyson for the family honor but also abuses the 9yo for fun. Still doesn't capture the gravity of the number of innocent people who have died, but it at least represents the parties involved a bit better.