Quite true. However, if several people whom you didn't know turned up on your doorstep asking to be let in because they had nowhere to go, would you let them in?
If you did would you tell them that they could stay indefinitely and you would provide for them? Would you allow any of their relatives who turned up at your door to enter and enjoy the same conditions?
Assuming that you let them in initially as an act of Christian Charity pro tempore and they continued to depend upon you, how long would it be before you told them you couldn't support them anymore and they would have to leave.
It is very easy to use "God is love" as a mantra rather than answer the basic questions above, let's hope you will do the latter.
The above scenario is a microcosmic scenario of what is happening in the U.S. and W. Europe. We have no way of discerning whether an immigrant is friend or foe but plenty of experience of those who were foes, especially lately here in Europe