In a sense, all financial service companies have a criminal element ... at least ethically challenged executives. All this was widespread during the 2008-9 financial meltdown. It's called greed.
The BOD and management want to milk the company for all its worth. Incredible salaries and incentive packages ahead for all those who stick around. Golden parachutes and bonuses if things go wrong.
Shorts are too busy making trips to the bank laughing their #$%$ off.
What make you think Ackman isn't selling. He probably has a few traders selling in 10K-100K lots at various exchanges.
I'm in at 200 shares at average cost of 42 and pondering buying 200 more shares at 20, lowering my cost to 31 ... well within the current target of 40.
I think the high volume is due to selling at the perceived peaks and buying on the dips. A good strategy may be to sell at 30 and buy at 25 or 20 and so forth. It will on occasion go a bit above 30 but will dependable go lower and lower.