And you go right ahead and help whoever you want to help. I will do likewise.  I am not saying it is the role of the Church to enforce immigration law.  Obviously Christians help whoever needs help, regardless of their immigration status. I am also not suggesting we call ICE when we help someone we know to be illegally here.  

It does not follow that the government does not have the right to immigration law--as any other country has immigration laws.  It does not follow that the US has no right to border security, as other countries have that right also--as the Vatican has that right.  

My point is that I am not going to call out the government for enforcing the laws of our nation.  We have the right to sovereign borders.  The government has the right to enforce immigration law.  There is nothing unjust, in principle about the notion that a sovereign nation has the right to regulate who is allowed in or who is allowed to stay.