>>5 The migrant crisis has given Europe a massive spike in crimes including rapes, murders, robberies, assaults, and left many nations with a huge minority that remains unemployed and uneducated, and which fails to assimilate to the cultures of their host nations. Large movements like these have killed countries and destabilized regions in the past (see: Roman Empire, Croats, Serbs & Bosnians, Roma/Gypsies, Norman conquests, Slavic migration, the Huns, Mongols, Moors, and outside of Europe with the Muslim conquests of Persia and Egypt and excursions in India. The US, Russia, and China today have less trouble because they historically make great efforts to assimilate others and reinforce their own cultures. Nations in the Muslim world themselves don't tolerate foreign cultures or migrants.)
Not to mention, large numbers of migrants either outright committing crimes based on religon, or advocating religious law and rejection of European culture and law. That's unacceptable.
Yes, turning them away may cause more deaths...and then they would be forced to work or fight in their mative lands to stop said violence and make their lives better, or be responsible for sitting by while they let wars rage on.
Compassion and good will can only go so far. Realpolitik works for a reason like this: It's practical to take a hard stance on immigration in this case, solidifying borders and placing the safety and interests of native Europeans over migrants who fail to assimilate and commit crimes.
In fact, incidents like this are the reason for the rise of populism in Europe, and the weakening of the EU. People tried to be compassionate and accept refugees, and got a crisis with terrorism and mass rapes and murders (and of course, the hits to economies and national sovereignty), which is why nations like Hungary and Bulgaria are building walls and kicking them out, why France and Italy are seeing right-wing parties on the rise, and why parties like the Golden Dawn in Greece are becoming more powerful.
On a related note, Poland, which allows almost no refugees, is regarded as one of the safest nations in Europe IIRC, and Finland has relatively little trouble with migrants as, in an actually funny story, they don't like Finland because it's "Cold and people are mean."
I love Finns. Poles, too. The Polish are great people, good company.