there is no way you can learn everything, so no need to feel bad about not researching an incredibly complicated subject.
In exchange for that summary, you have given me an insight into our food production process, which infinitely more important to society than arguing about what some guy that has been dead for centuries said ;>
and great point about PETA et al distorting what has been said; that was something I hinted at in the assumptions section, but didn't want to get get bogged down in.