They use the "Wall Street" they hate for the same reason Willie Sutton said he robbed banks: "It's where the money is." For the nihilist left there is no contradiction in that. They are deliberately exploiting the system they hate in order to destroy it. Willie Sutton acted the same, but was less evil: he only wanted the money, he wasn't try to destroy the banking system.

The viros do the same to property rights, They hate property rights and hate the real estate market. They don't believe land should be a "commodity". So the exploit the real estate market and private property rights to buy land and turn it over to government 'ownership' in order to permanently eliminate the private property rights.

I have a very good friend, my best friend from middle school in high school, who I don't see as much any more. He disagrees with me on Wall Street. He keeps his little bit of wealth in a paid-for house with a big safe that has stacks of gold coins, with only a small fraction in "contrarian" mutual funds. My family's little bit of wealth is about 70% in stocks and bonds, mostly domestic. It never even occurred to us to argue over it.

I can only guess what Wall Street critics think b/c they rarely say it. I heard a non-partisan commentator a few years ago say if you Google OWS, you would get pre-filled searches like "What are OWS positions?" b/c they weren't at all clear what they wanted. My guess is they think separating the owners from the liability results in unethical behavior, but I don't know. That would mean they're fine with debt instruments but not equity instruments.