Lawyer who cites environmental impact of immigration helped write SB 1070 and its clones

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We all know about Univ. of Missouri at Kansas City law professor, Federation for American Immigration Reform chair, and Kansas Secretary of State Kris Kobach for helping kick-start Arizona SB 1070 and its clones in Alabama, Georgia, and some other states. However, the Washington Post in this article "Self-deportation proponents Kris Kobach, Michael Hethmon facing time of trial" connects Kobach and another lawyer, Michael Hethmon, as essentially the two-man ALEC behind the laws:

Hethmon, 58, is a former hippie who left the United States during the Vietnam War. He works for a group that opposes large-scale immigration: It believes that, given how much food, fuel and space the average American consumes, the environment can’t take many more people.

The two complemented each other. Kobach was astounded by Hethmon’s intricate knowledge of law and precedent. Hethmon, whose parent organization, the IRLI, was designated a “hate group” by the Southern Poverty Law Center, was delighted to have an ally with political influence.

As for their roles in law-drafting:

Hethmon helped write an ordinance that passed in Prince William County in 2007. The two of them helped write legislation that made it harder to hire illegal immigrants; Alabama said businesses could lose their licenses.

And they helped with laws on police powers, such as one in Arizona that requires officers to check immigration status during any lawful stop if they have reasonable suspicion that the person is in the United States illegally.

In Arizona, Hethmon and Kobach became involved after GOP state Sen. Russell Pearce wrote the first draft of a bill — offering small revisions and in some cases rewriting whole sections — during a series of phone calls and e-mails. They stressed that it was Pearce who provided the bill’s direction. Their job was to show him a legal way to do it.

So Hethmon's view on immigration has roots in '60s hippie ideology, so I wonder why more left-wing environmental advocates won't support limited immigration? Perhaps because that's a cheap way to pander to the Racist Right like Ronald Reagan speaking about states' rights in 1980 Mississippi?