Actually, in this specific case, some of the practices of Wall Street were previously criminal. For example, up until 2004 there were laws that limited bank leverage to iirc 12:1 (or was it 14:1?).
Hank Paulson lobbied for that limit to be removed, unsuccessfully in 2000, then successfully in 2004. That banks and financial entities were levered up to 30:1, 40:1, even 60:1 on toxic securities when the crisis occurred grossly exacerbated it.
So essentially, 'gambling recklessly with credit' was indeed, for a long time, illegal. It was only Wall Street's increasing influence in Washington that got it legalized.
Hank Paulson lobbied for that limit to be removed, unsuccessfully in 2000, then successfully in 2004. That banks and financial entities were levered up to 30:1, 40:1, even 60:1 on toxic securities when the crisis occurred grossly exacerbated it.
So essentially, 'gambling recklessly with credit' was indeed, for a long time, illegal. It was only Wall Street's increasing influence in Washington that got it legalized.