^^Market making in and of itself, is a healthy, natural part of the market. All liquidity-providers, dealers, and speculators do this either inadvertently or [usually] in a uniform, repetitive manner (i.e. professional traders).
The saxo bank situation was peculiar because they robbed their clients so blatantly, with a requote several hours after the fact. Looks like there is at least
someone looking at a lawsuit.
The irony of the entire fiasco is that if they were truly trading against their clients, the losses would have been much smaller if the majority of client positions were LONG and they were SHORT eur/chf and/or had properly hedged their client positions. They probably would have been in profit.