Rev. Robin Hoover runs Humane Borders, a religous-based group of useful idiots which assists Mexico with their agenda to send their excess population to the U.S. in exchange for remittances. They do that by establishing water stations in the desert - some of which are paid for by Pima County. They also are or were distributing maps in Mexico showing the worst routes to the U.S. - and by implication the best routes.

Gail Russell Chaddock of The Christian Science Monitor has a not-as-horribly-biased-as-one-might-be-expected profile in "Backstory: The canteen man of the US-Mexico border". While she does use the inaccurate phrase "anti-immigration protesters", she does at least give a tiny clue that Hoover is serving Mexico's agenda:

In Mexico, support for the Humane Borders agenda is unambiguous. When Mexico's National Human Rights Commission announced that it would nominate Hoover and two Mexican activists for their human rights award, new Mexican President Felipe Calderon offered to present the awards himself last month – and did.

Chaddock does not, however, call Hoover on his BS. His moves encourage people to cross and are the opposite of humanitarian. If he wanted to be a real humanitarian, he'd come out strongly against illegal immigration and Mexico's agenda and he'd do whatever he could to discourage people from trying to cross the desert. He might have the best intentions in the world, but that doesn't mean he has the mental abilities to figure things out and think things through.

Related: One of the present or former members (Rev. John Fife) reveals the undisclosed more extreme side to the group. When pressed, Hoover shows himself to be a bit extreme as well.