Why so much hatred over a man made border?

It seems to me that the hatred toward illegal immigrants in the U.S. is becoming stronger by the minute. Why the growing rage toward people who cross illegally? I understand that they are indeed breaking the law, but don’t we all at one time or another? There is no need to become violent and aggressive over a man made border. I came across this article that just made me sick to my stomach!!
There has to be a better solution to this problem than brutality! Why are so many people unwilling to compromise and come up with a fair and humane solution to illegal immigration? Why the anger and the inability to empathize with them? It amazes me how much hatred there is in this country!