Why are Iraqi Christians Persecuted?

Iraqi Christians make up a mere 2% of the population of that beleaguered land, yet they face serious persecution that forces them from their homes and churches. They've been bombed, and killed, and many are afraid to sleep in their own homes at night for fear of deadly attacks. Many are without jobs and permanent homes.

One would think that Muslims who make up the other 98% of the Iraqi populace would not even take notice of such a small group in their midsts, or that they would treat Christians with a gracious kindness and consideration to try and bring them to conversion to Islam. Instead, they are disturbed to the point of violence that some might believe a different theology. Why?

If they truly believe that their god is merciful, just and good why don't they act mercifully, just, and good towards everyone including Christians in their country? If they truly believe their god is all-powerful why don't they allow him to convert or judge the non-believers without resort to cruel and unjust human violence?

What conclusion should the world draw from Iraqi persecution of Christians?