Immigration at the Rio Grande River

       Much press has been given to the "new" immigration problem: children crossing the border between Mexico and the US.  These children are not Mexican, but children from Central America, primarily Guatamala.   Their parents send them based on the perception that the new US policy is to accept them as minors in need of permanent protection, and to facilitate their permanent residency.
     This situation is the result of confusing messages from the White House and Dept. of Homeland Security.   Detention Centers for children are now full, and ICE is sending these illegal arrivals to far flung locations where underage individuals can be cared for adequately.  While they are treated well, their future is anything but assured.  A pathway home is not certain; reunification with family is doubtful anytime soon, and federal policy is obscure and confusing. 
     Vice president Joe Biden has been sent to Guatamala to explain to families that sending their children north through Mexico is dangerous and does not guarantee any secure future for those children.
     My question is:  " Where is the government of Mexico in this situation?"  Why do they allow these pass throughs to make it north to the Rio Grande?  What could possibly be the justification for turning the blind eye to this mass migration?  Business as usual........