Two lines are all it takes. The speaker makes a blunt claim: whatever reasons, flags, or speeches surround a war, the people actually doing the fighting and dying are children. It's a short poem, but it asks the reader to look past the grown-up language of politics and strategy and see who is really on the battlefield.
The title, "An insight to War," promises a kind of discovery, and the poem delivers it without decoration. The opening line, "No matter how you look at it," sounds almost weary, as if the speaker has already considered every angle and keeps arriving at the same answer. There is no shouting here. The calm, flat tone makes the statement hit harder.
The repetition in "children killing children" is the heart of the poem. Placing the same word on both sides of the act removes any sense of victory or villain. The mood is sorrowful and quietly accusing, leaving the reader with an uncomfortable picture that is hard to argue with.