Don't make me shut down the governemnt

The Movement to Defund Obamacare, Explained - Molly Ball - The Atlantic: It is amazing how the press and even many Republicans have bought into the Administration's preferred construction of the movement to defund Obamacare. The headline asks, "Will They Shut Down the Government?" And yet, just a couple of sentences later, gives away the game by stating that the "Democrats and  President Obama are unlikely to agree to gut the president's signature domestic achievement. President Obama are unlikely to agree to gut the president's signature domestic achievement." So, if the Congress, particularly the House, exercises its Constitutional prerogative to not fund the President's program the President will refuse to sign it and shut down the government and it will be the Republicans' fault because they should know that Obama would shut down the government unless he gets the money he wants? How does that even make sense? How do they get away with that spin?