Once I enter a screening area I will nod or shake my head but I refuse to utter one word, other than "get your supervisor." Three major airline pilots in this country have lost their jobs for comments made, and the AF FO will probably be number four.
Yes, everyone needs to be screened. What gets up my nose is when pilots are "randomly" chosen for gate screening. I deadheaded on a flight out of KMIA one morning, got the SSSS curse on my boarding pass, and stood in line for my special treatment. In line with me were a World guy and a Polar guy. So... the only 3 out of ~100 to be "randomly" searched passengers were deadheading pilots - each of us with a 10 year FBI background check and fingerprint screening!
Let's all go reread "Catch-22" - becoming more and more a non-fiction book....