Exactly. Wall street and investment have wonderful effects -- funneling money towards companies that can use it in amazingly productive ways. It provides an incredibly valuable service.
But the flip side is exactly this, that pension funds, ordinary investors, etc. wind up getting screwed.
I, for one, don't realy see the problem with Wall St. in itself, but rather -- who on earth is allowing the managers of pension funds to "gamble" with their money like this? Why should retirement accounts get invested in anything but government bonds and index funds? Employees get duped because they "trust" their company to take care of their pension, or "trust" their financial advisor to give them good advice.
At heart, I think it boils down to a fundamental misguided notion, prevalent in America at least, that investment is good, that you can grow your money, that you can outwit the stock market -- when the reality is, that for 99% of people, investment is just playing the lottery, and over the long run, Goldman etc. is going to win, because they're smarter than you. Just like, in the long run, the lottery always wins.