Who caused the money crisis?

1 Some people think that it is the managers fault because they paid the bankers to take risks.

2 Others might think it is the bankers fault because they should know when to stop taking risks and that the people might not pay it back.

3 Or they might think it is the people who take loans because they should not take a loan if they can't pay it back.

I agree number 3 . whicth do you agree whithand why ?