This is of course sick. I would have dumped him into the mediterranian. Anyway there would have been no chance of a extradition to the United States since there he would have been threatened by capital punishment there which is strictly forbidden in Europe. Germany and other European countries do not extradite to countries where the offender could end on a scaffold.
Hammadi was probably about more than 15 years behind bars. This is the usual timespan were killers are released in Germany. I doubt that it has anything to do with the recent release of this woman in Iraq since Hammadi was -to my knowlege- a shiite. The hostage was a German woman that was hijacked by some sunni criminal idiots who wanted to press out money. Merkel probably paid. But this is another party.
When will people wake up and realize that these people don't come here from those stagnant, wretched backwaters in order to contribute to religious pluralism?
This is war, and there seem to be very few people who realize that.