I assume he's being general, and rightly so. You can't be legalistic in crisis like these, you have to stand up to the challenges and work hard to find solutions. Legally, the EU can probably just murder everyone trying to cross its borders. Perhaps that's what PEGIDA would find as being the "responsible thing to do", I mean, borders still mean something right? Countries do have territories. But the problem is just too obvious to overcome: we are all humans and cannot deal with this stuff in psychopathic terms.
So, if we cannot do that, we might as well start, as one of my teachers once said, "hold the bull in the horns and deal with it". Do the best you can. Have a sense of proportion, always.
Crisis are always moments of opportunities. I hope Europe can mostly take advantage of them and strenghten itself out with it. They failed their test in the Grexit crisis with a F ****ing minus, let's see how they fare now.