If its ICE/INS type people, its for shooting brown people, or "wetbacks" or whoever wants to cross a line on a map guarded by a whole bunch of make work useless eaters. I would expect republicans and other "conservatives" to be having a happy day for this, it means ICE will be murdering "wetbacks" and "meskins" now.
As for me, the only real sin I see the meskins being "guilty" of, so to speak, is worshiping another false god. Their government in Mexico. Granted for most simpletons and simple minded critters, their government's flag is their own "cultural identity" no differently than for Americans, it isn't the rattle snake on the yellow (as it rightfully should be) its the federal flag from DC. Possibly the main reason why gringos and latinos hate each other so much, its on behalf of their governments that they do, and their governments greatly approve of it, as hatreds keep the government institutions from being irrelevant and rightly seen as the useless and damaging parasites that they actually are.
Nothing new.
+1 to Jim's comment.