alt Hacker News> Unlike other countries, most of the power grid is above ground. How can you be so sure that it is safe?
I didn't say it was safe by virtue of defensive capabilities, but it's safe by virtue of the US will very likely come bomb you or use its own cyber capabilities if you do something to the US. This is in contrast to the EU which was the comparison point, which is unable and unwilling to do much against cyber attacks.
My original post was more focused on defensive capabilities, but those things are hard to discern - you need to know about vulnerabilities in order to protect yourself from them.
If the damage is done, of course the US can massively retaliate. But ideally no damage is done :)