Let’s not forget that this Omar Mateen guy was born in the United States.
Which supports the conclusion that vetting the 1st generation is insufficient, the virus is carried in their belief system and will eventually surface in subsequent generations.
But his parents were not.
Importing people that do not come here to become Americans, but to change the US, whether it is illegals or Muslims with allegiance to their homeland is the problem. They pass their ideas onto their children and our public schools encourage it.