[Vigilanteman]

Excerpt from the article:
The rules will not affect citizens of Canada and 27 other countries -- most of them in Europe -- who are not required to obtain U.S. business or tourist visas, and who make up about half of the 35 million people who visit the United States each year.

In other words, we are sceening applicants mainly from countries who apply a higher degree of scrutiny to visiting American citizens. For instance, when I needed a visa to go to Saudi Arabia, I had to obtain an invitation letter from the business whom I was seeing there, fill out an intrusive application including divulging my religion (ethnic Jews are not welcome, so I had to write Christian), buy a 50 Riyal revenue stamp and wait for the Saudi embassy to grant the visa. Had we had the smae rules in place before 9-11, it is possible 15 of the 19 hijackers wouldn't have gotten in so easily.

[1066AD]

Technically, U.S. law already requires non-immigrant visa applicants to submit to in-person interviews, which generally last two to three minutes. But State Department rules have traditionally given consular officials broad leeway in granting exceptions.
So start applying the existing law(s) more strictly, that would be a good low cost start !