Oceanside?

Why the hell would Oceanside help Rick's group?  Why would Enid and Aaron think they could convince them?  As JRiddle said: this didn't even seem to belong in this episode.  After the way Rick and Co. literally buttfucked them and left them defenseless?
Now they accidentally killed Granny Oceanside....
Obviously this means that Oceanside WILL join Rick, going against all logic and common sense!