'Who are responsible for stock market scam' - -there are a number of views around. Some experts view that the responsibility partly goes on the shoulder of the central bank as it failed to play its role at the right time (or, played unnecessarily at the wrong time), probably not by its own judgement but guided by outsiders. Dr. Monzur Hossain, a research fellow from Bangladesh Institute of Development Studies (BIDS) wrote in the Daily Star blamed the Bangladesh Bank with some good arguments. Here is the link of his article.
Today, the Financial Express published a report, which tells that there was in fact a scam in recent stock market crash and the Security and Exchange Commission (SEC) was solely responsible for that as a section of top SEC officials allowed vested quarters to make the best use of illegal practices, as said by none other than Probe Body Chief Khandaker Ibrahim Khalid. Here is the link of the report!
So, cheers for truth!