I have a question for illegal aliens from Mexico?

It's the same reason that a lot of black youth is angry at the general white population. Many, nay, MOST illegal aliens are quite poor, and struggling through their day-to-day lives which probably SUCK. When you're that poor, that angry, and that beat-on by life then you're just looking for an outlet to express your anger, and the easiest one for them to latch onto, unfortunately, is America, the place that has given them so much. Most people grow out of this. A small percentage does not, and they're the loud, out-there ones you see acting so disrespectfully.