California fires

Why do all the recent California fires seem to stop at the Mexico border? Is the terrain so different - or are the Mexicans somehow in better control? (difficult to believe)

The fires that did NOT burn in Mexico may be like Sherlock Holmes's "dog that did not bark".)

It could be news blackout - 18 Mexicans died in the Gulf last week, but this seems to have been ignored (except briefly on BBC World Service).

In Wikipedia, references to this question and to the small number of fires in Mexico have been swiftly deleted by Americans.

The fact that the fires seem to have stopped at the Mexican border suggests that some at least were man-made, not natural.

Responses seem to have been characteristically brutal: one man was shot dead beacsue he was crouching and looked like he MAY have been starting a fire [http://www.guardian.co.uk/usa/story/0,,2198866,00.html California police shoot dead suspected arsonist]

Citation: "The Los Angeles Times said state police were also involved in the shooting, but it was not clear which force fired the fatal shot. Lieutenant Scott Patterson, of San Bernardino police, told the newspaper: "We don't know whether he was an arsonist ...""