So your response is that profiling "doesn't work", so there's no point in even discussing the ethical implications. Fair enough. I'm not sure I agree with that entirely, but it's a valid response.

Seems like you're setting up somewhat of a straw man w/ regard to profiling effectiveness, though. For instance the point that "if they know about it then it won't work". Sure, a terrorist group can disguise its operatives so they don't fit the profile or just choose people who genuinely don't fit. But that at least makes their job harder. Recruiting non-profile-fitting operatives gives them a much smaller pool to work with. Disguising profile-fitting operatives is non-trivial.

The govt. could also cast a wide net. Identify countries with sizeable Muslim populations, and increase the risk factor for travelers coming from those countries. Or flag certain first names, many of which are used by Muslims of all nationalities.

W/ regard to domestic terrorists and behavioral profiling, who said that couldn't be used in addition to other methods? You seem to be arguing that "profiling Muslims doesn't catch white, non-Muslim domestic terrorists, therefore we shouldn't do it because it's ineffective".