Maybe strong words, from the Synodikon of Orthodoxy: To those who deny the existence of God, and assert that the world is self-existing, and that all things in it occur by chance, and not by the providence of God, Anathema!
At the last foot pilgrimage from Warsaw to the Holy Mount Grabarka one of the priests leading it during his homily quoted it and emphasised that in human's life there is no place for fortuity, even "accidental" meeting has a reason, that however not always is not revealed to us.
The whole story of Salvation (I mean the stories presented in the Bible and the institution of the Church) shows us that "everything happens for a reason". The same is in our life. Many time something, that in the particular moment seemed to us a tragedy, in the very end appears to be a good thing, e.g in my case some my personal and schools problems and death of a few people have led me to Orthodoxy and later to some other good things, like realizing my passions.
Some things that we witness can be for us brutal like mentioned by Asteriktos death of a child walking in the street, but maybe it was the best time for him/her to die to reach the salvation?... - a few days ago I was talking with some my Orthodox friends regarding the issue of dying in some accidents and I consider this way of thinking quite good.
Of course, personally I do not understand some things (not) happening in my life, but on the other hand, I know that for sure there are some reasons for such situation. I don't know also the reason of these terrible things happening to Christians in Egypt and Syria, but maybe some people become in this way the confessors of the faith or non-Christians discover Trinitarian God revealed in the Orthodox Church.