Dale’s meeting with Herschel is the most intriguing minute of the episode. To him, there is no line between the walking dead and mankind. Rather, it is viewed by Herschel as a health problem. Schizophrenics could be unbelievably dangerous but they are not shot on sight.
Coupled with that the undead residents of the barn are friends and his family. Valid or not his reasoning is concurrently somewhat sweet, depressing and creepy.