I've been thinking about this, and since you mention your Buddhist and Christian friend and have explained a ittle more about your spitiual thought process, I can see how in the past (like you mentioned in your dream), eating animals could have started off as an act of anger (as well as starvation/survival or whatever else). I can see in some cultures, perhaps 'the gods were angry', or humans, and used sacrificial means (on animals) to justify or right the anger. In the bible, there are many sacrificial ceremonies. In Buddhism, energy can most definitely be transferred, including anger or contempt- but those cannot exit without peace or respect.
I've thought about this before too in some ways.
I understood your first post a bit more after reading it a second time. Sometimes our thoughts, especially if they're abstract, can jumble together. I just wanted to give it a bit more thought before responding.