There is a massive bubble about to get popped. Way too much margin lending has occurred in the past year, due to short-sighted relaxing of SLR policies that have just gone offline. Too much of it was used.
It would be like giving someone $10 million to go gamble at the casino, and they absolutely MUST pay back all $10 million. But instead of being conservative and only gambling with say, $500k to $1m, you gamble with $9 million of it all at once, and lost on too many bets, so now you're in deep trouble.