Why do Horde races want to be in the horde?

I think it is. Or more precisely, if the Alliance has to somehow own up/pay to all the evil it has commit. So should the Horde, and the price tag as we know is a lot larger on the Horde side.

There you are again, projecting. Again, what should the Alliance do to the orcs who killed children? Because a good chunk of them did/at this point even the new Thrall Horde has been party to such attrocities.

Presumably none of them. Considering aside from some high value targets like Doomhammer, all of those put in the prison were orcs that surrendered. Besides, most of them weren’t even made to work due to the lethargy.

Seems to me you were quite ok with the night elves losing stuff and you used the losses the Forsaken suffered as justification.

So again Dread, if the Alliance was to suffer for enslaving orc kids, what should the punishment be for the Horde who murdered them? Or do you support killing children?