 Because there's disagreement, and the framers would have said yes. That's exactly the way we set it up. We wanted this to be power, contradicting power, because the main ill that beset us, as Hamilton said in The Federalist when he talked about a separate Senate, he said, yes, it seems inconvenient, but inasmuch as the main ill that besets us is an excess of legislation, it won't be so bad.