I think the short answer here, is Bella is an American teenager, knows exactly what she wants and is going for it at all costs. I often use the excuse I was young and stupid (even if it was last week) as a kind of joke. But its just the teenage mentality. Hence why teenagers can relate and we cannot. The thought of caring for anyone beyond yourself is just not even a possibility. Yeah I didn't appreciate Edward knocking Tofu, it tastes just like chicken, and I happen to be a vegetarian, and am very satisfied. Once you get past the cravings for meat, the thought of eating it disgusts me. I'd eat human meat though, if nothing else out of curiousity.