Please consider the following:
The state department spokesperson repeated time and again that the US was not backing one side or the other.
But they are funding one side - there are plans to give the military aid worth $1.3bn (£852m) next year, and many senior Egyptian officers are trained in the US. Clearly there are lots of contacts, and the US has a lot of clout.
http://www.bbc.com/news/world-us-canada-23167490
I agree with the Foti Benlisoy’s arguments that I translated above, and we should be cautious about simple conspiracy theories that attempt to attribute one simple cause to highly complex phenomena. On the other hand, one cannot ignore the sway that the US has over the Egyptian military. They give them huge amounts of aid, and as they say, “He who pays the piper ...” I do not see how you can categorically assert that the US had nothing to do with the army’s intervention.
I am sure that almost everybody here would agree that, had the Egyptian revolution fully succeeded and not been hijacked by Islamists, and had ushered in a moderate, secular democratic regime, the world would be a better place by now. However, the way that the Egyptian military was always in the background was a cause for concern - they appeared at some stage to dump Mubarek and then were steering events along in the form of SCAF. I have no doubt that the elections held were free and fair. The Muslim Brotherhood assured the secularists that they would take their wishes and concerns into consideration and so the secularists supported them in the second round to keep the old guard out, then the Islamists pretty quickly reneged on their promises and the secularists poured onto the streets in protest. Then the army intervened. It is interesting to note that the secular Turkish press considers Sisi to be an Islamist, but of a different branch from the Brotherhood, rather than a secularist. I think there are striking similarities between Egypt and Turkey in that there is a highly articulate educated secular segment making up about 20-25% of the population, and the less educated masses most of whom are under the sway of the ‘opium of the people’, so that religious parties will probably always win fair elections.