An interesting statistic is that Google's is more profitable than Goldman Sachs by almost every metric. They have higher revenues per employee, higher profits per employee, higher profits per unit of equity, etc. Nobody is demonstrating in Amphitheatre Parkway about how Google is ruining the country. Because people are smarter than you give them credit for.
Did you check out the new yorker article I mentioned about ("what good is wall street"). Even an article like this, which takes a very dim view of wall street, notes the vital role that banking (and, yes, wall street itself) plays in a modern economy. "Moving money from where it is to where it is needed", is unbelievably important and good work, even if it is transactional in nature. A system that can get money from savings accounts and turn it into capital for businesses is spectacular.
The problem (well, according to the article) is that this core, economically useful activity is not the main function of walk street anymore (one academic cited in the article estimates that if the financial sector were limited to the useful activities, it would be one-third to one-half of its current size).
Venture capital has been around for centuries, and in its modern form, since about the 1950s. Very little of it comes from Wall Street.
I'm not going to defend rampant mortgage speculation and public bailouts. But be careful at the venom you heap on Wall St. We will miss it when it's gone.