I'm sure they are doing it now, but the potential for leaving a valve open or a computer virus doing the same is something that may never be discovered. There were a lot of Muslims involved in the Y2k remediation that would have exposed lots of electronically controlled systems vulnerabilities ripe for sabotage.
Interesting point.
And it may be a "we'll never know" kind of thing. Unless someone does a victory dance and explains how it was done.