They can argue whatever they want. The problem is, when you interview every passenger, during the interviews you are looking for - you profile - you do profiling, to find the suspicious ones and put them out from the rest of the passengers.
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After Lockerbie, everyone thought, now we've learned the lesson of how to be proactive instead of being reactive. Unfortunately, September 11 came and we know the result. Thousands of people lost their lives. Security totally failed, not at one airport, at three different airports around the country.