well you have your own opinion and i have mine lets respect each other.if Kaname is totally evil he would kill zero without thinking that yuuki might get hurt but since he cares for yuuki he let zero live.Have you read the manga?well lets just see what will be the outcome.

kaname cant protect her that time because he needs to finish the council because the council are the one who have evil plan and Yuuki wants to stay in the academy.thats the reason why he cant protect her and he entrusted yuuki to zero.. another thing I know Kaname have his evil side but I think he really loves Yuuki.Yuuki will get mad at Kaname if he force her to go with Him..Lets just see the next Chapter of V>K..