I for one am not counting on that and I believe that anyone that is is delusional.
I think it depends on where you live. In rural agricultural farm communities we have very few cops and they tend to be local guys come home from the service or after finding that city life sucks and they want to raise their family in the same environment they grew up with.
They are as concerned about TEOTWAWKI and defending the community from the zombies that will be streaming out of the city as we are.