From this:

...Since October, when [Weld County CO] District Attorney Ken Buck started seeking support for bringing a federal office to Greeley to expedite and increase deportations of illegal immigrants who've committed crimes in the county, proponents of the move have squared off against detractors.

Big-name supporters of a new Immigration and Customs Enforcement office in Greeley include Republicans such as Buck, the Weld County commissioners, U.S. Rep. Marilyn Musgrave and U.S. Sen. Wayne Allard.

Removing illegal aliens who’ve committed crimes, joined gangs and added to an overburdened criminal justice system, they say, is a no-brainer...

Speaking of which, let's fast forward a bit:

[Genie Canales, a professor of Hispanic Studies at the University of Northern Colorado] and many of the 600 demonstrators who packed city hall Nov. 15, she said, already worry about the public's ability to distinguish between people of Hispanic heritage, documented foreign-born residents and undocumented workers — referred to as "illegals." An ICE office would add fuel to the fire for the ignorant and intolerant, she said.

If there were no illegals there, there would be no chance of confusion. It's the demonstrators who are making that confusion worse, trying to conflate the terms "Hispanic" and "undocumented" and leading people to believe that all "Hispanics" are either illegal aliens or supporters of same.