Initially he supported President Assad but probably because the military, which own 15-40 % of the Egyptian economy, took a lot of money out of the country so he needed billions of dollars from Qatar and Saudi Arabia and therefore he needed to change his policy to support for the insurgents.It's not what they did before or during the election, wolf, it is what they have done since.
He was supporting Al Quida rebels in Syria, he was walking away from peace with Israel, and his administration (the MB) was persecuting and allowing the out and out murder of minorities in his own country.
As to the verification of this, talk to the tens of millions who rose up and protested against it.
The Egyptian military acted based on the public reaction to Morsi and where he was taking them.
As top running battles...these were happening much worse before the overthrow...much worse. 15-20 people at a time for days were being killed all over the country. Of course there is a backlash from the MB...but not fromt he general people on the street. They reacted with joy.
So...it was those people who ultimately decided this.
I believe it will hold. I believe a new, better constitution will be written and that a much more secular and fair representative government will ensue.
But time will tell.
Don't forget the MB are the moderate Islamists. The reaction of the extreme party might be very violent and damaging.
In the mean time the African Union has suspended Egypt's membership of the organization.