The obvious irony is that here in the US, illegal immigrants can get access to social programs, medical treatment, a well paying job and do it all without paying taxes (Oh wait - they do pay sales taxes when they buy things!).
Considered felons by the government, these migrants fear detention, rape and robbery. Police and soldiers hunt them down at railroads, bus stations and fleabag hotels. Sometimes they are deported; more often officers simply take their money.
Better yet, while they're here they can demonstrate en masse, run around waving the Mexican flag and whine about how they don't have "rights." All the while never worrying about getting deported.
Mexico has no problem aggravating our country's ills by promoting illegal border crossings, but when the roles are reversed, Mexico cracks down on illegal immigration like a Stalin Purge.