No new laws or regulations required.
99% of the time in the USA, blatant fuckery is already illegal six ways from Sunday. The last thing we need are more laws.
I think plenty of Bitcoiners were trying to have it both ways, telling the IRS and SEC that Bitcoin is not real money while cashing out their schemes on MtGox at the same time. As with any license to steal, this was too good to be true.
PPT operators did not have an incentive to go after pirate, unless they had also invested significant personal holdings in BS&T, because:
1) They were investing other peoples' money and taking a fee off the top
2) They could face investigation themselves if they went to the authorities.
That would make people worried about buying bitcoin because, simplistically, "Bitcoin = scams".