Because there are still a lot of idiots running around. Just like that drunk black dude (forgot his name), he risked the lives of the whole group for a bottle of alcohol. I would've shot him right then and there, left him for dead for that stunt.
I like the show but was a drag when they stayed in that Prison for 2 seasons (I think is Season 3 and 4). A lot of their episodes were about a whole lot of nothing. Not sure at what point you guys are on the series but without spoiling it, they got the message and picked up the pace.
I read on some website the 2nd Season on the farm, was a low budget season. Series producers were not sure if the show was going to be cancelled or not. Kind of testing the waters if they still have an audience. Season 3, the prison episodes were another low budget season. 4th season seems to be a hybrid which is ok with me, had more going on and now the 5th season has some WTF? Looks like they are going with separate story lines related to each other.