Your thoughts on the 2005 Mizuho Securities J-COM stock error? (Stock Trade Errors in general)

So I was looking up Mizuho Securities and apparently in the year 2005, they mistakenly sold over 600,000 shares of J-Com INC. for 1 yen each when it was supposed to have been over 600,000 yen. Tokyo Stock Exchange presumably neglected to suspend the questionable transaction and failed to address the colossal error.

http://asia.nikkei.com/Business/Companies/Mizuho-…

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Was it honestly Tokyo Stock Exchange's fault and did they deserve to compensate Mizuho Securities for an error that was enacted BY them in the first place?

In a rather muddy comparison to what happened to Knight Securities.. what constitutes Mizuho Securities being compensated through lawsuit vs. Knight Securities being rescued by investors?

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