1.Military cannot defeat ideology. This means biafra and bokoharam will remain with us for a long time as long as Nigeria exists.
2.Pride of nationalism. Citizens would not like any government imposed by foreign powers either directly or indirectly. Foreign-imposed governments are likely to fail. Afghanistan and Nigerian governments are examples.
3. Afghanistans have been poisoned by Western ideas. The country will never remain the same. West preaches what humans like. In the future more parts of the world will embrace Western idea and there would be fall of many totalitarian regimes.
4. War is business. War is source of income for some countries.
5. Human governments cannot bring peace to any nation.

It seems you don't know the difference between Biafra and Boko Haram.