Your opinion is unpopular because it makes no sense and does not improve security. The attacker will simply recruit a "Yian" because that's your blind spot now.
I would actually argue it does improve security since you're spending more time on the people who have a higher probability of being a terrorist versus those that don't.
What doesn't improve security is just random screening where you're frisking 4-year olds and senior citizens and letting the adult males walk on by.
It takes months to years for the regulation and security to start direct profiling a specific group. It takes this group a few days to change strategy. It's not very effective to have tunnel vision.
In that case, the odds of a Yian being a terrorist would increase, thereby increasing the odds of a Yian getting searched. If we assume that the odds of being a terrorist varies based on demographics, then this would catch more terrorists than random searches.
It reminds me of the N-armed bandit problem: use random searches some small percentage of the time, and use a distribution based on prior samples to identify subsequent searches. (It's not exactly the same, but the same technique applies.)
What doesn't improve security is just random screening where you're frisking 4-year olds and senior citizens and letting the adult males walk on by.