But instead of killing them all, they might have been better off capturing them, locking them up, and then beginning many months of interrogation and investigation to figure out who the guilty actually were. Rather than just mowing everybody down.
I don't take it as absolute, but my impression from
Lethal Heritage was that chemical interrogation in the 31st Century--as least among the Clans--was pretty solid science. IIRC, it was so simple even a warrior could use it. Of course, not everything from the books is absolute and there's no guarantee Phelan wasn't an outlier.
At this point, I assumed the Blackout was a multi-spectrum issue. The real technical ****** is having two (or more) adapting issues simultaneously. Decent technical knowledge would eventually assume hyperspace itself was somehow screwed or there was malicious code in the HPG software. But with overlapping issues--hyperspace irregularities, viruses with differing codes bases and origins--finding the correct result would be far more difficult.
You could theorize about a correct point of failure, treat it, test it, and get a failed result, indicating it wasn't a correct point of failure. In fact, you were correct, but the test of a good solution failed because a second issue was still present. Two or three or four interruptions of various severities, combined differently for each endpoint, and updated by malicious actors would be a satisfying explanation for the Blackout.
It's also, to me, consistent with the multi-modal attacks recorded on Gray Monday.
In that case, the SLOT virus and/or its WoB-cousin derived from the same SL code would almost have to be involved.