You know, as far as survivors for your post apocalyptic party goes having a bunch of trained cops in your debt seems like one of the better options. Evil cop trope aside, you're probably going to struggle to find more trustworthy and well trained random people in a zombie scenario. Well, if you live in a place with decent cops anyway.
Cops almost always being useless or bad unless they are the protagonist in zombie fiction kind of gets on my nerves sometimes.