I'm not scared, I live in a country with some sanity. But jetliners around the world also have flight deck doors. You are being a bit silly, airflight was new, a few pretty serious incidents occured, we put in some doors and the potential for it to happen again goes away.

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.