Just like the "proof" you provided to make the claims true?
It was the ineffectiveness of the congress, not the President who caused the downgrade. Everyone can point fingers, but around that time, it was the policy of the right to just say no. There inability to find common ground or - I am going to say it - compromise, was what caused the downgrade. Not the President.
I would argue there were meat eaters and omnivores in the room together. The republicans only would accept cuts. The democrats proposed both reductions in government (and tax cuts) as well as increasing taxes on some and additional investment in other areas. Paul Ryan voted against the Simpson Bowles legislation. The republicans refused everything except there extremely narrow view of the way forward. Remember the promise to compromise on the Simpson Bowles or we would see cuts across the board to get the debt down? Well the R's voted that down and now are screaming about the reductions across the board. Either accept that the debt is going to rise with the current spending, or accept that jobs are going to be lost.... even maybe military jobs.
To say that the blame lies with the President on any of that is laughable.