The US doesn't have a points based visa
Both have a similar systems so they can say who does\doesn't get in. With the EU we can't keep murders out.
"Rouf Uddin, 39, wanted by Belgian authorities in connection with the murder of his neighbour"
"Alexandru Cucu, 27, wanted by Romanian authorities for beating a security guard with an iron rod, metal pipe and an axe handle. He has links with the Enfield area"
"Janusz Kedziora, also known as Michal Krawczyk, is wanted by Polish authorities for actual bodily harm (ABH), criminal damage, robbery, attempted robbery and burglary. Officers believe the 28-year-old may be living in Newham or Waltham Forest"
"Balint Budi, 25, wanted by Romanian authorities in connection with human trafficking."
"Krzysztof Malkowski, 39, wanted by Polish authorities for grievous bodily harm and is due to serve 19 months imprisonment "
"Mantas Jurgsat, 25, wanted by Lithuanian authorities over an assault on a man who was stabbed multiple times.
Jan Hiszpanski, 36, wanted by Polish authorities for robbing a man after he was hit on the head and strangled
Silviu-Bogdan Bruzlea, 27, is wanted by Romanian authorities to serve a 20-year jail sentence for murdering a man with a baseball bat"
All hiding here. If we had the old kind of visa system they would not be here.
Also it keeps the UKs rubbish in the UK.