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If the computer is internet connected, it could exploit bugs to spread itself. Or come up with an ultimatum to ensure it doesn't have it's plug pulled for fear of wwIII, who knows. The thing is that it's smarter than us, it could come up with a lot of ways to trick us.

How do you pull the plug on a self-driving car?

You asume that computers will remain tied to a wall socket, which may not be necessarily true forever.

And even if, given all the bugs prevalent in our software, what are the chances of containing something that can not only fully reason around but also exist within those bugs?

Probably because we don't realize that it's harmful (by design, or by accident). Second, it's not 'a device', it could be the algorithm behind a seemingly helpful service, like Google search. Third, maybe it's used as a weapon against 'other people' (most likely).