Even animals have enough instinct of self-preservation

Illegal immigrants cannot just wander freely around our land!
We, the citizens of Europe, are paying our government, to protect us. We have to make a clear system of retention camps for people, who enter our territory. We then have to clearly establish their immigration status. This means that either they are a contribution to our society, or, if not, we have to have enough instinct of self-preservation, to not allow them, to cause havoc in our society. Even animals have such common sense!