Why are so many Hispanics Americans against boarder control?

I am an immigrant myself but was raised in this country. I don't want to see illegal immigrants from my country to come to the U.S because it would just add too much burden to our society. More competitions, more crime and violence, and more cost to our society. This country is already heavily in debt, with 15% unemployment in California and Florida. Can you guys share your thoughts with me why you are supporting an open boarder for illegal immigrants? I am just trying to get some perspectives here and not meant to offend anybody..After all, we are coming here to search for an American dream and have try to have a better life. But with influx of illegal immigrants, it is causing more harm than goods. Unless you give me a reason why having TOO MUCH illegal immigrants is good for this country (Don't pay tax, welfare, foodstamp, medicare)