I fully agree. However, I feel like if my best friend was saying strange stuff, I'm not sure I could go at her in an accusatory way. I might just think she had a little too much wine or something. I may not really start digging until the police contacted me.... my hindsight may have seemed a lot different at that point. And as far as we have heard from the EIN interview, LV, when speaking of zombies, stated to MG that they prayed away the zombies (she said this and stated that there were ALOT thousands of zombies being prayed away each time). I'm not recalling that we have heard that melanie was told Charles was a zombie and he was killed due to that. So maybe she didn't have a frame of reference for actually killing zombies yet?
I'm going from memory at the moment, so please correct me if I'm wrong.
Jmo.