If you really believe the public is kept safe most effectively by pretending to be fully blind to nationality when choosing who to screen at an airport (since you can't intensively screen everyone) I don't know what to tell you.
Although it's interesting that the same people who would take that position seem to also argue that colorblindness is actually a sin if it's done while processing a college application.
Reputation?
Are we deciding security policies by reputation or statistics?
I think I'd win the bet of "Americans have killed more people (per capita) in other countries than Saudis have", so it does seem relevant to be more wary of them. Especially given how widespread the former has been, compared to a few incidents with the latter.
> If you really believe ... I don't know what to tell you.
That does seem evident, yes.
> Although it's interesting that the same people who would take that position seem to also argue that colorblindness is actually a sin if it's done while processing a college application.
Citation?
That is true only if you start the count in 1946 or later!
Iowans have committed significantly more homicides per capita than people from most European countries (or Saudi Arabia, for that matter). I don't think it's problematic if European airports screen Iowans more heavily than Europeans and Saudis. Do you?