Are we primitive men?

Casualties increasing day by day in Ukraine because of War, more of them are general person. They are attacked by guns and bombs unrealistically including infants, this kind of phenomenon are nothing but massacre at all. Difference of nationality, race, religion, language, ideology and historical background are good enough reason to destroy as the enemy?
Did they anything bad or inconvenient to be stolen their lives by others? Or villainous convicts on death row?
If not, why kill each other rather than share and give?
Who on the Earth received the legitimate right to stop other's lives from God?
Are we cultural people living in 21th Century or Primitive man?