It may be a stretch, but after the removal of President Mohammed Morsi by a popularly instigated coup, there was a small window of time where the army and the opposition could have adopted a genuinely reconciliatory tone, since they had the upper hand in how events were going to play out. While the nature, history and general interests of the army can be blamed for preventing the army from doing so, the opposition — or at the least the “revolutionary core” of pro-democracy youth activists — could have struggled harder to push the new military and civilian leadership to begin shaping the new order on democratic values.
This is not to say that anything can appease the Muslim Brotherhood at this point and push it to reintegrate into the political system, nor to ignore the fractures in the loosely strung-together opposition.