Yes ....that is called profiling.....it is how you prevent and solve crimes..... but the beards are pretty unique in that they don't go above the lip in most cases
But it is just one indicator.......you can ask if they are Muslim if you are renting a truck or plane or selling a weapon to a young Middle Eastern man with a huge beard if you need to narrow it down further..... if they say "No..... I am a pro football player or NBA star" you can be pretty sure they aren't terrorists
Found this about Israel and profiling which we could learn a thing or 3 from.
https://www.quora.com/How-does-raci...k-How-does-Israel-vet-people-who-travel-to-it
"Unlike the TSA that spends unimaginable resources looking for nail clippers and water bottles, Israeli security is based on the premise that it's not knives and bombs that bring planes down, it's people. It is for this reason that they spend more resources looking at the passenger rather than scanning what he's bringing on board (they don't even make you take your shoes off).
The way this is done is in layers that start even before you get to the terminal building. Some of the methods are unabtrusive and you may not even notice them, while others are more obvious.
The most obvious of the screenings takes place while you are waiting in line at the check-in counter. A young Israeli security guard will come over to you and start asking questions. Some of those questions seem quite normal (what was the purpose of your visit? Who packed your bags?), while others will sound quite random (What synagogue do you go to? Who was your Hebrew school teacher?).
The point of this questioning is to judge your reactions, assuming a terrorist with nefarious intentions would get quite nervous at the questioning and eye contact.
People with backgrounds that may make them prone to wanting to harm an Israeli plane (Arabs, "peace activists" with certain organizations, known trouble makers, etc.) will probably be pulled over for a more thorough examination.
If you fit into one of the above categories set aside some extra time at the airport while you plan your schedule (alternatively you may want to consider flying out of AMM)".