I am glad they had to eat these trades. Retail investors usually get stuck with trades in these situations if they lose and canceled if they win. While the big traders cry and get their losses in these situations canceled. About time they have to be responsible for their own mess. If the HFT's realize they can get wiped out and will not be able to cancel trades easily maybe they will clean up their algo's.

" Knight Capital Group Inc. was forced to keep more than 100 bad trades that sent the market-maker near the edge of bankruptcy because of Securities and Exchange Commission rules adopted after the 2010 ‘flash crash.’"

See rest of article at link below:

'Flash crash’ rules made Knight keep bad trades

I agree....I think this problem is self solving eventually.

Like all capitalist problems, eventually the feedback from the free market will alter the behavior.

When all the trades and volume migrate to dark pools and there's nothing left for HFT to manipulate and it's a bunch of buzzards fighting over the same small hunk of meat, this issue will go away.