An emailer:

While it is kind of disturbing, it is also very cool. Obviously a
civilian cares enough to point out flaws in our system. He should
realise, of course, that what he did could easily cause hysteria. His
inclusion of notes definitely clarifies his intent.
This reminds me of what happens with Linux and the open source Operating
Systems. People will hack into other people’s systems, but not
maliciously. Instead, their intent is to point out the reality of a
security flaw that they found. They then post or publish a report of
what happened, including why they believe it works (or just what causes it.)
While this is kind of annoying, being hacked into, it is also very
positive; people get a sense that they are not un-hackable, and not only
that, they also are aided in improving their security.
They say eternal vigilance is the cost of freedom. And apparently,
Americans want us to remain vigilant. Maybe next time he could suggest
what can be done to stop this kind of intrusion.