Don't get me wrong. I have no personal beef with you :)
Specific statements which I am refuting:
"but the profiling is mostly behavioural" - behavioral profiling is secondary to the racial stuff. At the end of the day, a screener here is more likely to forgive some quirky behavior on my part because I am white and Jewish. Obviously, I have no hard science with which to back up this claim. My anecdotal sampling of friends indicates that their skin color and racial origin played a pretty immediate part in their scrutiny, since they tend to be geeky and harmless just like me.
"It's also more or less impossible to distinguish (visually) Israeli Arabs and Sephardim/Mizrahim." - As I said in the post, this isn't true. Even if it were true strictly on a visual basis, there are other cues to go by beyond skin color. And regardless, the screeners know the difference as soon as a conversation begins -- so what's the point of this statement?
"You're not going to get hassle for having darker skin." - again, no way to directly prove/disprove, but my anecdotal friend-experience says otherwise.
You are correct about the self-fulfilling aspect; if I was an Israeli Arab flying out of TLV, I'd probably be worried that they're gonna gestapo me in a closed room. Particularly so if I know that I'm not any kind of terrorist, and have no fondness for interrogations.