Do you truly support immigration in your country?

I am aspiring to live in the United States of America but I have seen and heard of some really bad experiences of those who have citizenship over there. Most of those bad experiences comes from the locals who live there giving the immigrants a very hard time. I have heard of instances of unfair treatment and verbal abuse. On the other hand I thought to myself if someone came into my country and took my job or get better treatment than me in my own country I would be upset too. So do you truly think that immigration is a good thing?