I know that area. Right off Imperial Hwy. by Anaheim Hills. Basically the other end of Imperial Hwy and one of the worst sections of traffic in all of Southern California. I've been stuck on that stretch for hours before.
There's basically zero crime near there so no surprise the police respond like that.
If there's a house party and neighbors call the cops the police pull up deep. There's probably not much to do for them out there.