The reason hijackings where not taken seriously until 9/11 was because it was very rare for hijackers to harm passengers.

You litterally said it yourself. 9/11 changed the fact hijackers would use large aircraft as weapons of mass destruction. Preventing control makes them useless for that.

Taking bets its because airplanes have much higher security such as locked cabin doors with limited access. But sure its the guy strip searching you for having 5 ounces of water.

You can run your own ai models locally. Even if they were trained by the evil corporations. Do you also feel the same way about artists who pirated photoshop? Does that devalue their work?