Can there be a good reason (not political correctness – a GOOD reason) that I haven’t heard anyone make the following proposal regarding protecting ourselves from terrorism?

1. Those who have attacked us are, without exception, Arab Moslems who are not citizens of the United States.
2. Therefore all Arab Moslems who are not citizens of the United States that are now in the United States shall be required to
report for questioning.
3. The first question is: “Do you solemnly swear that you will cooperate with the United States and its allies in defeating
those entities that engage in terrorist attacks on the United States and its allies?”
4. If the answer is “yes”, then the subjects can be asked particular questions about anything relevant they may know.
5. If the answer is “no”, then the subjects should be immediately deported.

I’m limiting this to non-citizens, who don’t have the same rights as citizens.

So why, other than PC or general timidity, aren’t we doing anything like this?