[prostoalex]

People usually put an equality sign between high-frequency trading and algorithmic trading. One is a subset of another.

There's also a subset of algorithmic trading that inserts large stop-loss orders (not much of an algorithm there, it's just done by computer program instead of an individual), which have been known to cause flash crashes.

Hence the confusion and belief that by eliminating HFT we'll eliminate automatic stop-loss orders.