They could find runaways at bus stops .. They tell them they have a job for them someplace.
It's in no way inconceivable, people just don't believe in conspiracies are how evil people can be but history says otherwise. If it was to some how get covered up, people will go back to not believing it. Whatever the news says, that;s what they believe. When stuff gets pushed out into the open enough then the news has to report it even if maybe the higher ups would rather not. They can't lose all credibility