No, U.S. did not turn its back on Egypt. I think that U.S. did what they were asked to do and provided them with support and the necessary tools to rebuild. There are too many issues going on in the U.S. for us to be off fighting another countries fight. Lets start helping ourselves out for a change.
The United States is in a time of crisis at home, and has been spending too much time and too many resources on the issues of other nations while ignoring economic, political and social issues at home. It is unfair to say the US turned its back on Egypt, the US has no business being involved in Egyptian national issues in the first place, so by staying out the US did the right thing.