I used to be active on this forum. I'm not so much anymore - life got in the way of my internet habits.
Still, I saw the thread and had to respond.
First, I'm a FAM. Been one since the program started up. Was in fed LE work before that for some time prior, as well as local LE work. Still only a rookie with twenty years of LE work total, though, so caveat established.
Second, I dont give a crap where you're from or which God(s) you pray to, so long as you try to enforce your way of thinking on me or mine, particularly at the point of a knife or gun. Try and kill me or mine and I will kill you back.
Third, FAMs aren't there to make arrests. Oh, we will if it becomes serious enough, but getting involved in every single silly incident on a plane is counterproductive and makes FAMs even easier to spot and neutralize than the jackheaded policies in place already do. FAMs are first and foremost there to either prevent the hijacking of a plane or re-hijack it if it does fall into enemy hands.
Fourth, FAMs aren't there to disarm people. That's the TSA screener's job. But think on this - the passengers had the same access to the same weapons as the terrorists did on 9/11. It did not work out well. And if you think there has been a mindset change in the citizenry since 9/11, I posit you haven't been paying attention. I have a very long and detailed position post I've made on this years ago if anyone's interested. If not, I can't disagree with you on that - it's not a popular opinion on arms control,, I understand. I'm 99% of the time not in favor of limiting arms, but in a very few areas I am. Civilian aviation is one of them.
Fifth, as far as arrests go - how many arrests do you think the President's security detail makes a year? The ones that actually protect him 24/7? I'd bet none. They're not there for that - they're there to keep the President from being killed. FAMs don't do much in the arena of investigations. That's the FBIs job. Would we entertain the notion of canceling the President's protection detail?
Sixth, explosive decompression of an airplane to an errant round is not an issue whatsoever. That myth came from James Bond - Goldfinger I think. The plane is not airtight. Explosive decompression of an innocent person's skull is, which is why we train so much in firearms, CQB and tactics. But the plane is not an issue, unless you hit the hydrolics.
Finally, feel free to ignore what I wrote above. Its mostly my BS opinions, and I'm wrong about 80% of the time anyway.