1. Children are going to become older and in any case they still think more rationally than any animal, the senile and mentally impaired still have souls.
What about plants? They are alive too! But just being "Alive" doesn't make you have a right to life.
In any case, I don't support the absolute right to life either. I support the death penalty for certain exceptional crimes, but that's an entirely different issue.
2. No, you really couldn't, but my point was, if you want to think that vegetarianism is the only moral option, I don't have an issue with it. I would disagree with you, but I wouldn't really mind so long as you intended NOT to enforce it in the lawbook.