[javert]

As I said, it helps make sure that doesn't happen.

Anyway, I don't think they'll blow themselves up big, like Dark Knight Capital did. First, this specific kind of thing doesn't happen often (where one firm just messed up so much that it makes world news). Second, it's clear from Jane Street's videos that they're pretty serious about quality. If I were going to bet on which market maker will screw up, it would be somebody else.