Actually, it was all of those people. The economic collapse we saw was a direct result of the burst in the housing bubble, which was caused by poor people buying homes they couldn’t afford and banks giving them the money to do it, thanks to government telling them they had to. Common sense tells you if you make $40K per year you shouldn’t buy a $200K home, but people were happy to do it and banks were happy to let them.
If you want to protest, do it in front of Fannie Mae’s offices, not on Wall Street.