The problem is it is QUITE possible to know the identies of all those killed after the mob violence has abated because you can look at their faces.
In most countries people killed in violence are immediately evacuated by police and held in police morgues. Generally I expect this also happens in Egypt. I'm expecting - perhaps I am wrong - that it would be difficult to know for sure who they are until police release names.
I expect - this being Egypt, not France - that after mob violence started, both sides acted like, well, mobs. This is backed up by the fact that soldiers were also attacked for 'not doing enough to protect' the church.
Most importantly, even if we grant that everything occured as you claim it did, we are still talking about a nation of 33 million.
Let us assume that the formal statistics are correct and 9% of Egyptians are Copts - that's about 3,000,000 people.
Let us project the trend and assume 60 Copts will be killed this year as you predict. This constitutes a rate of of 2.0 people killed for religious reasons per 100,000. This is important - the rates per 100,000 are how you measure the prominence of violence in a society.
This does not rise to the level of 'oh we gave these people some freedom and they all launched themselves at the Christians to start killing them!'.
The Egyptians neither have a Democracy, nor are they launching themselves at the Christians to kill them en masse.
Indeed, I am at a loss to understand in what way the lack of Mubarak contributes to this at all.