Well... for me it depends on the SHTF.... Are we talking about another Hurricane Andrew down here in S. Florida? Because if that's the SHTF guess what? We're on Alpha Bravo and I'm working 12 hour shifts trying to help my community as best as I can. Yes, my family comes first.... the moment the storm passes I will check on their well being and make sure that they're okay. I'll also make sure that my family has water, food, and medical treatment if needed. But I'm not abandoning the community I swore to protect.
No one here can't state that they will not try to make sure that their loved ones aren't safe.... if you do you're frakking lying through your teeth.
If it's a Red Dawn or OMG Zombies.... guess what... most PD can't do jack in that except try to help the Feds, the National Guard, and the Reg Mil. Even then who knows what.... What role can police be used for in an event like that.... not a clue.
Those that left their posts in Katrina are a bunch of rats.... every PD has them. Most guys and gals will do what is needed and then some. I'm not abandoning my post unless I have to for my own safety or that of my family.