Earlier quoted context omitted.
In the US they are effectively deregulated in close to every way the actors care about (aka regulatory capture). Additionally, enforcement of the few regulations that exist is close to nonexistent. Edit: downvotes, so here's some references: On Regulatory Capture: a growing number of respected commentators now argue that regulatory capture of public agencies and public policy by leading banks was one of the main caus…
I cannot find any hard data on the very long term trend of numbers of SEC enforcement actions, but they seem to be on the rise in the long term, though they have fluctuated greatly. From the books I've read and interviews I've heard, it seems that the opposite is true; financial sector prosecutions have become so common that it is now regarded as a 'cost of doing business' more than a stain on one's reputation. edit:…
I'd say the "cost of doing business" thing cuts against your argument, though. I read that as the regulations (or the regulators) not being strong enough to keep bad actors in check.