For instance, the "swarthy" guy next to me pulls down his tray, pulls a condom of material from his ass, and starts assembling a bomb in front of me.

First, I'm going to start pressing that attendant button above of me (probably the first 10 seconds will be sent pressing the wrong button and turning off and on the "air")!

After that doesn't work, I'm going to really distract him with questions (ever louder) and nudge into his personal space and knock over the stuff.

In retrospect, it could have been lots of sugar that he enjoys for his tea, and I would get the stink eye for knocking it over, but this personal diligence would be far more effective than what is proposed now (e.g. 4th plane of 9/11).