Main Character's Decision

I do not agree with the main character decision. Yuuki thinks Kaname won't harm any humans after he saved her life when was a young girl. Yuuki thinks people and vampires can coexist with each other, but I disagree because vampires can only come out during the night time. Although I disagree with Yuuki, I would like to agree with Zero that the vampires are planning something. He thinks the vampires took the form of humans not to hide themselves, but to hunt humans more efficiently. After a vampire assassinated Zero parents, who wouldn't feel deep hatred for them. I think monsters shouldn't be trusted at all, but they can be trusted if they prove themselves.