Why not? If it is completely random, it is actually fair, and it'd filter out the people who seem suspicious but who are not. If there has to be a very good reason in order to search (probable cause) then people who understand the pattern can avoid it. If there is a completely random chance you get the special treatment, people will always have to be careful; not just when they're being suspicious.
Except you're between borders. You do have the very same rights airports as borders as well. Customs can check every person who decides to pass the border. That they don't is their choice; not yours. Don't like it? Don't leave your country.
> and must have looked suspicious or something
Can it not be that you were coming from Beijing?
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