Say what you want about Mexicans, they have a hard work ethic and would rather work for $$$ than blow up cars.
Not all are here to work. They make up a sizeable portion of the California prison population. They murder, rob, and sell drugs.
Incarceration. The cost of incarcerating illegal aliens in California's prisons and jails amounts to about $1.4 billion a year (not including related law enforcement and judicial expenditures or the monetary costs of the crimes that led to their incarceration. There are an estimated 48,000 illegal aliens in Californian prisons.
The Costs of Illegal Immigration to Californians: Executive Summary