How many tragedies have been enabled by suicidal pilots + the locked doors? I know of at least one case in the Alps and pretty sure there was another in India recently enough?

I'm not sure they come out that far ahead really, though obviously the incidents they were designed to counter are bigger and more headline grabbing.

There's a parallel comment to this one talking about some of the drawbacks (though TBH I think it's a reasonable risk/reward tradeoff).

But I haven't seen any actual justification that the no-fly list is actually useful, and worryingly the regulations around it are classified.