> They weren't at a casino. They lost the money in trading markets.

Yes. They've gambled away the money that didn't even belong to them in a game of chance.

It's a casino, but with other people's money.

> And a moment of due diligence would have so informed anyone considering investment in anything

Ah yes. It's not the criminal who's at fault. It's all the people who didn't think this was a criminal.