I don't think that's quite fair since the US justice system does allow for and has come to include advocacy organizations like the EFF and NAACP, and, even without those organizations usually individuals will end up paying significantly less for the same legal services (since most lawyers do have morals and will try and make their services affordable to less well off clients).
But... other than those allowances... Yea, money is pretty important in the US justice system.
I mean... those are organisations that are support a collective ideal.
People that buy into that ideal fund those organisations so they can provide legal support to enact those principles.
The existence of those organisations (or pro bono work) is not a counterpoint to the premise that the US justice system is predicated upon money (and the implied corrolary that the level of justice you receive is proportional to the amount you pay for it).
(having said that, I don't necessarily agree with the flippant comment that you are replying to, but still).
