The way human beings work is through cooperative efforts where raw materials are processed into all kinds of materials for the basic materials to survive and more elaborate products. This type of activity has to take place in cooperative efforts, unlike for animals that can eat off the ground or eat other animals, no special processing is required. Thereby, animals can exist on their own, they do not require cooperative efforts so necessary for the living quarters, food, every aspect of life unlike humans.
So, when the relationships necessary for humans to exist are opposed or there are dysfunctional relationships, war results. The relationship will have to happen the only question is whether it is harmonious or disharmonious. It's just a law for human beings.
We can't seal ourselves off, this is the lesson of wars, see how former enemies become trading partners, like Japan and Germany. So it is with so called asylum seekers, these are the manifestations of increasing pressure to stabilise relations between different peoples into a natural functional relationships. The pressure will continue unless we properly respond to develop the relationship into a functional and normal way between the peoples of countries where asylum seeking orininate.