If the prison system is working
at all we would expect to see violent crime drop as the prison population increases. There's a profit motive as well but we have to remember why societies build prisons in the first place.
Only 10% of California's prisoners have never been convicted of a violent crime. I doubt they all need to be locked up but I'm not seeing those prisons as being filled with peaceful drug dealers like the rumor has it.
I would guess in New Hampshire there isn't much of an immigrant population. I just looked it up and it's about 93% white there. My state's about 2/3's white, I live in a part of town where I don't walk around after dark because I might get jumped for being white which does affect my perspective. I have neighbors who immigrated from Mexico decades ago and still don't even speak basic english. I'm not saying my state should become all white or anything like that, but maybe we've reached a good mix and we could deal with the problems our hispanic and black communities already have because that's a challenge as it is. We're struggling to get them to stop killing each other, make it through high school and to read at a basic level. If we can't do that I don't know why we think we can take on even more people.