You guys seem to need some counselling in anger management...
To me it does not really look the moment for petty fighting, even if the issues are serious.
A Syrian and Egyptian passport have been found with the attackers, and a French national has been identified. Syrian passports can be boucht anywhere in Turkey and elsewhere for some hundred dollars. In Germany there are currently 250.000 people, mostly Syrians, who have entered the country unregistered.
My message is, perhaps this is not (yet) the moment for entertaining conspiracy theories but for morning and expressing sympathy with those suffering.