From security purposes, it is a good system

[1] what if a visitor murder someone and he runs away?
[2] trace possible criminal
[3] trace possible terrorist
[4] manage the visitor [my visa expired and i stayed here for 7 years]

For legal and right, it is not a good system
[1] we are being watched and scanned for everything
[2] we are being treated as possible criminals / suspects
[3] very costly

Do I support this system? They have these operations enacted a few years already.
I think it is a good system, but watch the reaction from the foreign visitors.