There are a lot of people in this world who mean to kill Americans in any way that they can. A passenger plane, as we've learned, is a great way to kill a lot of people. If you definitively know who people are, it is far less likely that a mass murderer is going to get on a plane, whether to use it as a bomb or to get here and develop networks of like-minded mutants on our shores.
It is NOT one world; in many countries where we have people who would kill us, there are few birth records, dates of birth are estimates, names are in 5 parts and often octupules, and there are no biometrics (fingerprints, iris scan, DNA profile, facial recognition photo). Most are one change of planes from a major US destination. In Mogadishu, I could fly to Dubai, Doha, or Istanbul then directly to most major US hubs. Same-same Baghdad, Amman, Georgia, Armenia, Sudan, Ethiopia, Eritrea, Mali, and on and on.
Evil flourishes in the dark and in anonymity.
Wait a min. For 4 yrs the last administration told me it was one big happy world. Hell , half of Congress and half the Senate are still telling me that. What gives ??????