No offence to either of you but think about what you are saying.
How do you know who was herbivores or carnivores? Did you live back during "day one"? This is the exact kind of "deep thought" that I do not like. People assuming things because of their opinions that they have no idea about.
These are only assumptions. Don't say "oh THIS is how it WAS, I *know* it!". Sure there are some "proof" to these theories, but you can "proove" both theories just as well scientifically, by physical evidence, etc. We also have no real proof of when man's days began. So even if we look into the stomach of a 10,000 year old ice age man and see meat, that doesnt mean man ate meat from the beginning or vice versa.
Just like my mom talking about how "we did not evolve, the missing link theory is crap" just because she is a Christian. Well so am I but I am also open to that theory, because I do not know God exists nor do I know that we evolved from an ape. Either theory is just as much possible. There are physical ways to proove both theorys.
Just a little thought. Be more open minded. Don't let your opinions cloud your mind.