The man :
There is a discrepenty (a gap) between the way the man is dressed (he is wearing a suit and a tie) and the damage around him (houses are on fire). Normally, there should be soldiers and not a businessman. He's certainly an arms trader.
He looks self-confident and powerful. For him, selling weapons is as if he were selling food, jewels or clothes.

He sells weapons as if he were in a meeting in the US.
He sells weapons as if it were normal to do that.
He sells weapons as if the were toys.
He sells weapons as if could solve problems in Africa.

The bullet:
We follow the life of a bullet, from the beginning (its creation in the US) to its target (the head of a child in Africa). We see the scene as though we were the bullet.
The target(/aim/purpose) of the movie is certainly to denounce the arms trade cynically. We are considered as though we were the killers, as though we had our share of responsability in the arms trade.