“If a person bearing that tattoo is subsequently found within the US, they can be summarily executed by anyone: citizen, government employee, fellow illegal alien — anyone.”
Sheesh. You can’t execute a serial killer in prison but you can cap an illegal at will.
It’s for discouraging people. They are outside the law and it should be open season on them. Personally, I feel the government is doing a really poor job on law and order issues, and I support a more flexible system in which private citizens can take an active role.