> Try viewing this from the TSA’s or an attacker’s perspective instead

Those are two very different ones, though. Of the TSA I hear nothing but "theater", so I don't know if they're a for-profit, an organisation to make people feel safe, or just implementing the letter of the law; regardless, the attacker's perspective would be entirely different.

And if you read a few of the comments, most of them do view it from an attacker's point of view. Nobody is going "my precious water has to be thrown away", but rather arguments about what kind of attacks it stops and doesn't stop.