So, anecdotal?
Really? One incident for every 1,205 flights. I don't know if you are an airline pilot, but if you are, maybe you don't see it, and maybe you are right that it's fine the way it is because it isn't that frequent. But how many flights are there in a year worldwide? That ratio isn't huge, granted, but still, it's a fact that WHEN it happens, there are no professional security team unless it happens that an air Marshall Is on the flight.
How many flights per year are you working? I'm just an occasional passenger on commercial flights, not even yet a GA pilot, just a student, and I also haven't experienced really serious incidents. But the numbers are there. And they are not insignificant. The main thing is WHEN it happens there is not a good contingency plan.
Can you at least grant that there is really no public equivalent in our normal ground based lives where you have several hundred people locked into a place with virtually no real security personnel? I haven't seen many imposing large folk as flight crew, and it is a stretch that they are able to handle any passenger that gets weird, feisty, combatantative, or a danger to the other passengers and crew. The fact is, no matter how you slice it, they are depending on their customers, who are not necessarily trained security, to step in if it gets hinky.
Even though accepted because of history or because for some reason it is the norm, it is a kind of unique situation. You honestly believe that it isn't a problem that this is the plan? Ok...if so, we just disagree. That's ok.