He's two years old, that's not uncommon behavior for a two year old, you have a choice though to simply pick up your baby and leave the room... go into another room and close the door behind you. My belief is that even if the child who is hurting yours isn't your child you get to keep your own kid safe... especially if the kids parents refuse to do anything about it. Now that doesn't mean you need to be hitting the two year old, but you can tell him to be gentle and show him what that means.
You can tell him that we do not hit or throw things. And, if all else fails, then, again, you don't have to stay in the same room if your own child is unsafe. Sorry, but your dad needs a kick in the head, just because you may be young to have had a child does NOT EVER mean that child deserves to be hurt.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.