Where Fun Comes to Die

Congrats to Obama, here’s hoping for strong and enlightened leadership over the next four years.  But will somebody please explain to me the following statement from Obama’s acceptance speech:

Let us remember that if this financial crisis taught us anything, it’s that we cannot have a thriving Wall Street while Main Street suffers – in this country, we rise or fall as one nation; as one people.

Is this a normative or positive statement?  In other words, is Obama saying that Main Street’s suffering led to Wall Street’s collapse?  Or is he saying that we shouldn’t allow Wall Street to do well if Main Street is suffering?  If the former, I’d like to understand what the theory of causation is.  If the latter, what would be the method of enforcement?