They come from compton, south central, south LA, watts, huntington park, inglewood, etc.
To understand why they are doing this, we need to understand where they're coming from.
1) either one of mom and pops are in jail, or both in jail and under foster care or grandma care, or parents are shooting up all day
2) high school delinquent or drop-out,
3) no real job so no money
4) recruited as part of a gang or "crew"
Since there's absolutely nothing else better to do in Compton where they're statistically more likely to get shot by their own people with B-on-B killings as evident in Chicago, it's better to commit these crimes in "less resistant" and more "subservient" neighborhoods.
There has never been a case I've heard recently in which a homeowner in Irvine has fought back with fists, weapons or a gun.