How many hijackings has this resulted in, though? The existing solution seems to be good enough.
It's just a door, I am pro literal defenses and against security theatre. Maybe if we shore up the cabin we can relax some of the other bullshit theatre going on.
Listen, I know a guy.. he works for free if you let him keep the carcass. You don't want to take risks with tigers.
The tiger could probably jump over the cart though, maybe we should be worried.
The threat no longer exists. You're scared of imaginary tigers.
It's less like an imaginary tiger and more like patching a really obvious risk with a cheap solution. Rather than relying on some wild dramatic movie hero scenario to play out, just close a little door. No big deal.
That change (arguably itself unnecessary) was made in response an incident that happened shortly before that change was made. This new change is being made in response to... that same incident 20 years ago, which hasn't repeated.
The tiger doesn't exist.