It would have fallen well short of "politically correct" for the Interagency Guidance to indicate that check cashers who routinely deal with illegal aliens are high risk.
Have you seen or heard about a regulatory
presentation or an
article where regulatory personel mention the Matricula Consular favorably as a form of identification, without noting that the vast majority of those who offer it as ID are in the U.S. illegally? (Not all regulatory personnel agree with that stance and not all of the agencies display the same amount of fervor.)
Regardless of what is PC, you are entitled, but not required, to reach the conclusion that MSBs dealing with significant numbers of illegal aliens are high risk. (The underlying premise of the Guidance is that it's
your risk asssessment and there are no automatic answers anymore.) You might even get some support for your conclusion from field examiners...