Will the Christmas market attack further divide Germans over immigration?

They've charged the Saudi psychiatrist -- who’s lived in Germany for 18 years -- with several counts of murder and attempted murder. But the anti-immigrant, far-right Alternative for Germany party has made gains in opinion polls ahead of February's snap election. And just days after the fall of the Assad regime, the government in Berlin froze asylum applications from Syrians. Will Friday's carnage, coupled with the dispute about migrants in Europe, divide Germany even further? Could police have done more to prevent the attack?