Lyric discussion by rimastratocaster 

"The heart, the heart it beats for blood" One meaning is that it's because the blood that heart beats and the other is that our hearts beat for shedding blood and making wars!

"We got what we want ask anyone But war is still war it's medicine The wind's at our back when we attack 'Cause God is our man He understands (the heart) it beats for blood"

These lines certainly allude to war! Specially those wars that the US government has been/is making!

The rest of the song is personal feelings and relationships and the war inside with oneself or someone else!

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