If this is real, then this is really horrible. To think they allowed these people into their countries. Heck, in Italy they're putting these miscreants in hotel while there are native Italians living on the streets.
Why do they think that dogs are unclean, pretty weird and stupid to attack someone because of a pet. People like these definitely need to be deported but i don't think that killing them and harvesting their organs would be the right solution.
They find the smallest excuses to do these stuff. I live in a country with a Muslim-minority, they get upset about everything. As for organs, who knows what still undiscovered diseases these things are carrying? AIDS came from Africa after all.