My innocence been dead
He’s very far past the part of his life that consisted of the innocent Kendrick Lamar, hence it’s “been dead.” He’s now part of the change. “My innocence been dead” also refers to the line of a newborn killing a grown man: killing someone does mar your innocence.
As he said, he’s in the dead centre looking around. In other words, he knows what’s going on around him and can therefore make a responsible judgement.
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