I know about the Puntland and Somaliland conflict because I'm very politically aware of the events in the Horn. Keep in mind my father lived in Mogadishu from 78 to 81, 82, when he was a member of the Oromo Liberation Fronts army. My dad, Allah yarhamu, knew the Somali language very well and the politics of Somalia too, he obviously met and knew siad barre too. Other family were members of the struggle and some died on the path of liberating their people from oppression.
As far as it not being self defense, bro if u go try to kill random oromo civilians, then expect to be fought with every weapon you can dream of that's in the Ethiopian army, lol, it's that simple sir. I don't support the criminals from either side, oromo or Somali. Anyone with the blood of innocent people on their hands, from either side, should go to a court of law.
As far as the land issue goes, I've always been an advocate of settling it through the will of the people living in the effected areas. As far as oromo being in Somalia, if you knew how many Somalis live in oromia, your jaw would drop. Yet they still are there. A lot left during the violence, but many remain. Keep in mind, even Addis ababa is oromo land. The cushitic people like oromo and agaw are considered ancient Ethiopians and were on that same land, and even more at one point, for thousands of years. Don't let the propaganda of some of the habesha elites fool you, the oromo were always there.
All of our expansions influenced others. Oromo expanded east, stopping the Somali and afar expansion that way,... Somalis (Ogaden, darood led it)expanded south displacing and assimilating some oromo (warday) and acquiring more land. The shoan Amara and oromo allied and gained the Alliance of other oromo clans and amara groups, and expanded everywhere, east west, south, and made the Ethiopia you see today...
Basically, hate us or love us, you can't deny we are related and have all influenced each other.
There are many mixed oromo Somali families too, people who speak both languages, what would u do to them, massacre them too?