Gosh, what makes you think they are something besides "red blooded white american (sic) citizens"?  Do you have knowledge about them that no one else  has?
Seems to me you're doing a fair share of pointing fingers all by yourself.  Are you advocating illegal entry into this country?
If I  had the opportunity to speak with "someone who has spent a week walking across a desert to come here", 
I'd ask them why they didn't do it the LEGAL way.