There is really no reason for a show with this production budget to be so stupid. Right now I'm only continuing to watch it for the occasional good survival scene, like Nick's arrival on shore/exploration of the camp/use of camouflage. The premise that people would suddenly be in organized raider gangs a few days after a zombie outbreak is just silly and stupid.
As is the idea of that Mexico could block fleeing hordes, even if the country had managed to avoid a direct outbreak so far. Tom, in case you didn't realize it, the scene at the beginning with helicopters patrolling the sea wall was supposed to indicate that the Mexicans were patrolling the border and preventing anyone from crossing, because apparently they maintain sufficient resources for 24 hour, seamless, border security, loool.
I don't think it's entirely clear that Strand is gay, by the way. He may just be an opportunistic huckster taking advantage of the fact that Dougray Scott is gay. But probably not, as that would be more interesting.
The cast desperately needs a culling, quickly. Everyone other than Strand, Nick and Ruben Blades is just awful.