I think you're giving the writers too much credit to suggest that there's some conspiracy. Honestly the chopper could easily makes sense, it belongs to whoever runs the Prison I guess which seems to be pretty close to the farm. Also, Lorie wasn't angry about Rick killing Shane, she was angry that her son had to shoot him down, which is perfectly reasonable for Lorie for once, if you noticed she didn't back away from Rick until he told her that. The group's reaction to the "big news" is pretty silly but I can empathize with their attitude towards Rick when he told them he killed Shane, I wouldn't be surprised if they just didn't believe that Shane tried to kill Rick or that Rick really wasn't forced to kill him. I have to say, Andrea was a fucking survivor in the last episode. Besides Rick and Darryl I couldn't see anyone else persevering like that after being fucking left for dead twice.
My biggest gripe is Hershel's complete lack of a response to the fact that he (yet again) lost half of his remaining family in a single night, he seriously doesn't even bat an eyelash to this. Oh right...T-DAWG GOT SOME FUCKING LINES AND A FUCKING PERSONALITY