BTW, it is viewed even more harshly if you are illegally immigrating into Mexico. Check the links I gave earlier to see how Mexico views such actions against its sovereignty.
Why should Uncle Sugar view the reciprocal differently than Mexico?
The major fault in the logic that you and others use is that these Mexicans force their way into the country. The reality is that the US lets them in, allows them in, welcomes them in.
And in more recent times, its not just Mexicans, they are from all over the world. There are 50,000 illegal Irish here.
There is a demographic reality that you can ignore if you want to, but it ain't going away.