Is it ethnic profiling though? A thought experiment is to imagine a country nearly identical to the US in ethnic composition, culture, size, GDP, etc but is rivals with the US on the same level China is. If you were going to apply for a security clearance in the USA and your spouse and their family was from this rival bizarroUSA, I think you'd be subject to similar scrutiny. Just a question of where your (or your spouse's) national loyalties lie.