The conflict from which these people are fleeing has created as many refugees as Norway has people.
The logic of deterrence that generates the industry of human trafficking runs as follows: regulatory enclosures result in physical and economic enclosures that must either be worse than some of the worst warzones on earth to be a deterrent, or otherwise simply inflict lesser harm and quite often death on all the people they fail to deter.
When a citizen of a resource-rich country (like my own) speaks with concern about 'negative economic impact' and 'increased social tension', that's what they're ultimately propping up, and yes there is a moral responsibility for those innocent people who suffocate to death in the back of a truck or drown on the open sea. There are other choices.