They think the goo is, er, "downloading" into people and slowly replacing animal life with its shapeshifty self. The explanation videos are four hours worth, but I found a fifteen minute version and dumped it in the hopper. It's from a goo-molestee. Apparently, the military dumped it into the London sewer system and now its hellbent on global domination.
And is anyone taking bets on whether or not the broken people who believe this stuff never heard of it until after the X-Files had a similar alien creature on the show?
Forget that, they'll probably claim that was someone trying to warn humanity about it.
The black goo in X-Files was a living entity (not nanomachines) and was designed to pacify humanity to accept alien takeover. I don't remember it having the ability to disable machinery or anything like that.