You don’t become part of a country because you desire it; you become part of it because your survival depends on it. 
Despite the numerous wars fought in Ethiopia, most of which have been fueled by external forces through Eritrea and Somalia, the majority of Ethiopians continue to live in their homeland. 
In contrast, most Somalis and Eritreans have been forced to leave their birthplaces due to unbearable conditions. This speaks volumes about the situation.

Somalia, Eritrea, and Djibouti, in their truest sense, are not independent countries. They were created as counterpoints to Ethiopia, existing primarily as strategic bases to attack it. 

Naturally, Ethiopia will defend itself, and such conflicts will render the entire region inhospitable for human life. Therefore, the integration of Somalia, Eritrea, and Djibouti into Ethiopia is not a matter of choice but one of survival.

I realize this line of reasoning might be beyond your grasp, so you will now resorted to insults.