KFP!
*shrug* I still like TWD, despite some pretty big character development flaws, it's still doing what it set out to do.
The purpose of the scene with Rick shooting the two interlopers was showing us how he's now learnt exactly why Hershel wants them to get the fuck out. Laying it on a bit thick sure, but there we go.
In saying all that, Lori going out on her own to find Rick so early? She knew Rick was going to find Hershel and bring him back, and they'd barely had time to even get to town before she set out. For fucks sake, what a stupid cunt. But hey, we already knew she was a stupid cunt anyway, so whatever. Stupid action for sake of plot, what are you gunna do.