Everyone contributed to crashing the economy, from those non-bank financial insitiutions pushing the bad loans through and dumping them onto wall street so they could turn around and lend more, the people buying several homes with NINJA loans to flip so they could make bank, to retailers selling like mad on credit to people who were buying those homes to fill those houses up.
Everyone was making money hand over fist. And everyone suffered. Unfortunately the ultra rich not suffer like the rest of us. But it doesn't mean they broke laws. Even if the populous would like to run around with pitch forks and torches.