Anybody, regardless of their nationality or ethnity, is allowed to legally enter the U.S. It doesn't matter that they look or speak differently. Any of these illegal aliens, who currently resort to sneaking across the border in the middle of the night, could have instead filled out and filed the necessary documents in order to be able to come to the U.S. legally. They just chose not to do that. Instead, they chose to violate our immigration laws. Now, when groups of American citizens patrol our southern border to try to prevent anybody, regardless of their nationality or ethnicity, from illegally crossing the border, individuals like you start shouting "racism!". It seems that your agenda is racemongering, and you are very good at it.
How many self-appointed buttinskis are patrolling the wide-open Canadian border which is much longer and over which terrorists have actually entered our country? Or the Atlantic, Pacific or Gulf coasts?
Gee, the defenders of the border looney tunes claim that they are just stalking their targets and reporting them to law enforcement. Now you say that they are "trying to prevent" those of any nationality from entering the US over its Mexican border. How many Norwegians are they tracking? How many Chinese? How many Bohemians? Any Finns? Oh, that's right! Its just Mexicans but that is just a coincidence, right? How could I have thought otherwise?
BTW, Peter Brimelow, apparently Honcho at VDARE, is himself a British immigrant but that's different. His wife is a Canadian immigrant, but that's different. Their child is described by Brimelow in his execrable screed, Alien Nation, as blue-eyed and blond-haired as he explains his determination that America in 2050 should look like little Brimelow.
Tally ho, thanks for letting the Brimelows into the US. Now let's make some rules to keep THEM out.